Acknowledging the existence of non-international armed conflicts and the rules that apply therein

Notwithstanding the occurrence of devastating international armed conflicts (IACs) in the twenty-first century, NIACs continue to represent the dominant form of armed violence around the world.Footnote ¹³ Whether a government is seeking to contain armed violence between two or more ANSAs on its territory, is itself engaged in armed violence with an ANSA, or has been asked to intervene in a situation of armed violence to help a host government defeat or contain an ANSA, the State(s) concerned (and other relevant actors) must assess whether or not a specific situation is properly characterized as a NIAC, principally because such an assessment will determine whether IHL applies as a matter of law.

It is well established that identification of a NIAC is not always straightforward: indeed, in a 2009 issue of the International Review of the Red Cross dedicated to the subject of conflict classification, Toni Pfanner, then editor-in-chief, described the matter as “the Achilles heel of international humanitarian law”.Footnote ¹⁴ It can be difficult to confirm relevant facts on the ground, but a greater challenge is posed by the fact that (1) differing and somewhat inconsistent definitions of a NIAC exist in various treatiesFootnote ¹⁵ and under customary international lawFootnote ¹⁶; (2) these definitions are of such a high level of generality that they provide little guidance in non-obvious cases; (3) very few judicial decisions have concerned borderline situations, or situations determined not to amount to a NIAC; and (4) factors identified by international criminal tribunals to assist with the assessment taskFootnote ¹⁷ are, unsurprisingly given the context in which they were developed, more suited to ex post facto analysis.

The first treaty provision to extend (minimal) rules of IHL to NIACs, Article 3 common to the four Geneva Conventions of 1949 (common Article 3, CA3), does not provide a definition of NIAC, but rather states that its protections apply in “armed conflicts not of an international character occurring in the territory of one of the High Contracting Parties”. The drafters of CA3 deliberately refrained from including a definition.Footnote ¹⁸ In part this was because it proved impossible to agree on a set of criteria, but it was also because, at the time, a majority of States were resistant to the notion of IHL applying in NIACs, and did not want the application of the rules to have any degree of automaticity.Footnote ¹⁹ This was a consequence of the fact that (1) States were opposed to the general idea of international law governing matters wholly within their borders (which was in turn perceived as enabling the interference of external actors);Footnote ²⁰ (2) States were concerned that the applicability of IHL rules in NIACs would confer a degree of recognition on ANSAs (undermining the authority of the government, and providing an opportunity for ANSA conduct to be characterized as “acts of war” in order to escape criminal punishment);Footnote ²¹ and (3) the applicable IHL rules were seen as a constraint on a State's freedom of action,Footnote ²² as reflected in the fact that the prevailing view of humanitarians at the time was that IHL should be applied as widely as possible.Footnote ²³

Perhaps inevitably, the omission of a definition allowed many States to deny the applicability of CA3 to situations of armed violence. This resistance in large part explains why, when more elaborate rules applicable in NIACs were adopted under AP II, its scope of application was carefully restricted under Article 1(1), which refers to

As a result of the threshold criteria set out in Article 1(1), it is generally agreed that while CA3 applies in all NIACs, as a matter of treaty law AP II applies to a more limited subset of NIACs – the price paid for reaching agreement on (somewhat) more expansive rules. Specifically, AP II only applies to those NIACs to which governmental armed forces are a party. The application of AP II also requires a greater degree of organization on the part of ANSAs in addition to requiring that ANSAs exercise control over territory, such that they are able to carry out sustained and concerted military operations and implement the Protocol. Finally, it is generally agreed that AP II requires a higher intensity of violence compared to the threshold of hostilities required for a situation of armed violence to be classified as a NIAC generally.Footnote ²⁵

Since CA3 and AP II were concluded, the reach of international law into internal matters has been normalized, at least to a degree, with the growth of international human rights law (IHRL) and international criminal law in particular, such that resistance to the applicability of international law to matters taking place wholly within the borders of a State is not as sharp as it was at the time of the adoption of the Geneva Conventions and their Additional Protocols.Footnote ²⁶ With the emergence of ANSAs with sophisticated transnational capacity, such as Al-Qaeda and ISIS, recognition also appears to have become a second-order issue.Footnote ²⁷ Perhaps more importantly, with the development of IHRL, the perception that a law enforcement characterization of a situation of armed violence provides greater freedom of action has greatly receded, such that it is now widely acknowledged that IHL's rules are more permissive than those of IHRL, particularly in relation to the use of lethal force and detention, and thus carry an operational advantage for States.Footnote ²⁸ As Claus Kreß has written, in the context of his argument that the threshold for the application of customary IHL is likely congruous with that of CA3,

At the same time, States are increasingly conscious of the fact that their failure to set out their views consistently on the proper interpretation of IHL's rules (including the test for the legal framework's applicability) has created a vacuum that has been filled by other actors, including courts and tribunals, the International Committee of the Red Cross (ICRC), expert groups, and scholars, in a way that might not always reflect the position of States,Footnote ³⁰ leading at least some States to attempt to reclaim this space.Footnote ³¹ In addition, the growth of international criminal law means that the consequences of violating IHL are now more real, at least where a relevant court or tribunal has jurisdiction, such that there may be a pressing need to accurately identify the applicable rules of IHL. In situations where one or more foreign States are intervening in a situation of violence at the request of a host State, it is also desirable for military partners to have shared views on the classification of a situation for reasons such as coalition-building and interoperability, as well as public messaging. In other words, while States once deliberately maintained ambiguity, there is reason to believe that at least some States today see an imperative to classify situations of armed violence accurately and to precisely determine the rules of IHL that apply therein.Footnote ³²

The Brereton Report's description of the legal framework that governed the ADF's operations in Afghanistan

There is certainly no evidence of any reluctance to identify the situation in Afghanistan as a NIAC in the Brereton Report – although the Report's articulation of the IHL rules applicable to the ADF in Afghanistan leaves much to be desired.

In describing the legal framework applicable to ADF operations in Afghanistan between 2005 and 2016, the Assistant Inspector-General of the Australian Defence Force, Major-General the Hon. Paul Brereton, author of the Report, states:

The Report then states: “It follows that the applicable offences in Division 268 of the Criminal Code are those concerned with war crimes committed in the course of an armed conflict that is not an international armed conflict, and in particular those in Subdivisions F and G.”Footnote ³⁴ As the Report notes, Subdivisions F and G of the Australian Commonwealth Criminal Code respectively mirror Articles 8(2)(c) and 8(2)(e) of the Rome Statute of the International Criminal Court, with Subdivision F containing war crimes that are serious violations of CA3, and Subdivision G covering war crimes that are “other serious violations of the laws and customs applicable in an armed conflict that is not an international armed conflict”.Footnote ³⁵ The Report concludes that the war crime of murder (Subdivision F, Section 268.70) was the offence “most relevant” to the Inquiry,Footnote ³⁶ with the war crime of cruel treatment (Subdivision F, Section 268.72) identified as being “also relevant”.Footnote ³⁷

A critique of the Brereton Report's analysis of the applicable international law

The correct identification of the legal framework applicable to a military operation is crucial because it determines what bodies of international law apply, as well as the specific rules in the event that IHL is engaged, thereby informing the international obligations of the State, including under the law of State responsibility, as well as the obligations of individual personnel as a matter of international and domestic criminal law. For this reason, it is concerning that the Brereton Report's conclusions in relation to this issue are scant (a single paragraph in the 465-page public redacted version of the Report is devoted to the identification of the applicable rules of IHL),Footnote ³⁸ as well as imprecise and incomplete.

It is agreed that at all times relevant to the conduct considered by the Brereton Report, the conflict in Afghanistan was properly classified as a NIAC. This classification of the conflict is widely accepted,Footnote ³⁹ but it would have been useful for the Report to have included a brief explanation for the conclusion, given that it is not something that is obvious to a non-expert reader. This could have been done succinctly. In 2001, there was a pre-existing NIAC in Afghanistan between the Taliban government and the Northern Alliance. The initial use of force by the United States and United Kingdom against Afghanistan in response to the 9/11 attacks gave rise to an IAC that came into existence in parallel to this NIAC. Following the conclusion of the Bonn Agreement in December 2001 and the UN Security Council's establishment of ISAF under Resolution 1386Footnote ⁴⁰ in June 2002, the Loya Jirga was convened that established the Karzai government, which was recognized as the authority in effective control in Afghanistan. Thus, in late 2001, or mid-2002 at the latest, the IAC ended, and (generally speaking) ISAF members became party to the NIAC between the government of Afghanistan on the one hand and a range of ANSAs (including the Taliban and Al-Qaeda) on the other. This reflects the prevailing view that when one or more foreign States intervene in support of a host government that is a party to a NIAC, that armed conflict retains its non-international character (as distinct from a scenario where a foreign State intervenes in support of an ANSA).Footnote ⁴¹

The Brereton Report fails to consider whether Australia's participation in ISAF made it a party to the NIAC in Afghanistan as a matter of law. IHL does not clearly articulate a test for when a State becomes, or for that matter ceases to be, a party to an armed conflict. Assessments generally hinge on the degree and nature of a State's participation in military operations. The ICRC has advanced a support-based approach that focuses on the issue of whether an intervening State's activities “have a direct impact on the opposing Party's ability to carry out military operations”, distinguishing this from activities “that enable the Party that benefits from the participation of the multinational forces to build up its military capacity/capabilities”,Footnote ⁴² although some have criticized this as setting the bar too low.Footnote ⁴³ Nevertheless, in light of the fact that Australia was involved directly in combat operations against the ANSAs in Afghanistan over an extended period of time, it can safely be concluded that from 2005, Australia was a party to the NIAC in Afghanistan as a matter of law.

What is not canvassed in the Brereton Report is the fact that Australia's last combat troops were withdrawn from Afghanistan in December 2013, with 400 personnel remaining in Afghanistan as part of a train, advise and assist mission.Footnote ⁴⁴ Advisers, support staff and force protection elements were assigned to the Afghan National Army Officer Academy and the Special Operations Advisory Group based in Kabul, with additional advisory support provided to the Afghan National Army's 205 Corps Headquarters in Kandahar, and embedded staff in ISAF Headquarters. Until the end of 2014, Australia also assisted with the provision of intelligence, surveillance and reconnaissance through the provision of remotely piloted aircraft.Footnote ⁴⁵ Following the end of the ISAF Mission at the end of 2014, Afghanistan took the lead on its own security. In October 2015, Australian operations were scaled back further to 250 personnel fulfilling advisory and mentoring roles, and embedded roles in the Afghanistan security ministries and at NATO Headquarters.Footnote ⁴⁶ Whether the post-2013 Australian mission involved any activities “beyond the wire” that would enable a conclusion to be reached that Australia continued to be a party to the NIAC in Afghanistan is somewhat unclear. On the basis of publicly available information, it seems not to be the case. If this is correct, it would mean that, contrary to what is stated in the Brereton Report, Australia was not in fact bound by IHL as a matter of international law for the final three years of the scope of the IGADF Inquiry.Footnote ⁴⁷

It is uncontroversial to conclude that as a party to the NIAC in Afghanistan (from 2005 until at least the end of 2013), the ADF was bound to apply CA3. As quoted above, the Brereton Report states that CA3 “applies as a matter of legal obligation”. Confusingly, it then goes on to state that “as established customary international law, CA3 applied to all ISAF members”. It is thus unclear whether Justice Brereton is of the view that Australia's obligations under CA3 arise as a matter of treaty or customary international law, or both. Moreover, contrary to what is asserted in the Report, the decision of the US Supreme Court in Hamdan v. Rumsfeld Footnote ⁴⁸ provides no support for the proposition that CA3 applies to all parties to NIACs as a matter of customary international law.Footnote ⁴⁹

What Hamdan does provide authority for is the proposition that CA3, as a matter of treaty law, has extraterritorial effect. Indeed, it is widely agreed that CA3 must be applied by all States party to one or more of the Geneva Conventions that are a party to a NIAC (i.e., the territorial State, as well as any foreign States and multinational forces operating under national command and control that intervene in support of the territorial State), as well as the ANSAs involved.Footnote ⁵⁰ As such, even though it was operating extraterritorially, the better view is that, as a party to the NIAC in Afghanistan, Australia was bound to apply CA3 as a matter of treaty law. To the extent that there is any room to doubt this conclusion, it is clear that Australia was bound to apply the minimum guarantees contained in CA3 as a matter of customary international law.Footnote ⁵¹

In the current context, the more significant point to be made in relation to customary international law concerns the Brereton Report's assertion that “certain provisions of the Geneva Conventions are applicable as a matter of customary international law”. It is undoubtedly true that customary rules mirroring various provisions of the Geneva Conventions apply in NIACs, but such a conclusion is not particularly helpful given that it provides no guidance as to which rules exactly apply. The statement is also incomplete: the rules of customary international law applicable in NIACs do not exclusively derive from the Geneva Conventions, but also stem from Additional Protocols IFootnote ⁵² and II, and other treaties, such as those prohibiting the use of various weapons and the recruitment and use of child soldiers.

The Brereton Report's silence on Additional Protocol II

The Brereton Report's most significant omission is its failure to refer to the applicability of AP II to the ADF's operations in Afghanistan.

Debates as to whether AP II applies to a particular NIAC commonly hinge on whether the ANSA party or parties in question are sufficiently organized and in fact exercise control over territory, and whether hostilities have met the requisite intensity threshold. These issues are not particularly controversial in the Afghan context. It was widely accepted that during the relevant period there were continuous hostilities between the government of Afghanistan and a number of ANSAs,Footnote ⁵³ including the Taliban, which (1) had a membership in the tens of thousands;Footnote ⁵⁴ (2) employed a hierarchical command structure that was able to replace leaders who were killed, and in some parts of Afghanistan resembled a shadow State;Footnote ⁵⁵ (3) was governed by successively published codes of conduct (the Layeha for Mujahideen), which included organizational and administrative provisions as well as rules relating to the conduct of hostilities and accountability in the event of violation of those rules;Footnote ⁵⁶ and (4) exercised effective control of a significant overall percentage of the country.Footnote ⁵⁷ As such, there is little dispute that AP II applied to at least the conflict between the government of Afghanistan and the Taliban.Footnote ⁵⁸

The key issue that arises in the context of ADF operations in Afghanistan is not whether the NIAC in Afghanistan met the higher applicability thresholds found in AP II compared to CA3, but whether the Protocol has extraterritorial effect, such that it applied to those AP II States Parties that intervened in the NIAC. As noted above, Article 1(1) states that the Protocol applies to “all armed conflicts” that are not covered by AP I “and which take place in the territory of a High Contracting Party between its armed forces and dissident armed forces” (emphasis added). This is followed by the requirement that dissident armed forces control “part of its territory” (emphasis added). While this clearly requires the territorial State to be a party to AP II, and for the requirements of an AP II NIAC between the territorial State and one or more dissident armed forces to have been met, the formulation raises the question of whether AP II obligations are only owed by States Parties in respect to NIACs on their own territory (and their ANSA adversaries that meet the criteria set out in Article 1(1)), or whether a State party to AP II that intervenes in an AP II NIAC on the territory of another State Party is also bound to apply the Protocol's rules.

Admittedly, available State practice on this interpretive question is quite limited, the ICRC's influential Commentary on AP II is silent on the matter, and academic work on the issue is threadbare. The little academic opinion that does exist is divided. Jelena Pejic,Footnote ⁵⁹ Sylvain Vité,Footnote ⁶⁰ and Annyssa Bellal, Gilles Giacca and Stuart Casey-MaslenFootnote ⁶¹ are of the view that a State party to AP II intervening in a qualifying NIAC on the territory of another State Party is bound to apply the Protocol's rules, although only Bellal and her co-authors put forward any arguments in support of this contention – namely, that such a conclusion “better fits” with the language of Article 1(1), is more in line with the object and purpose of the Protocol, and allows for a more practical application of the law.Footnote ⁶² Nils Melzer,Footnote ⁶³ Dapo Akande,Footnote ⁶⁴ and Robin Geiß and Michael SiegristFootnote ⁶⁵ claim that foreign States intervening in NIACs are not bound by AP II, although the authors advance no arguments in support of this conclusion beyond an assertion as to what they claim is the proper interpretation of Article 1(1). Martha Bradley concludes that AP II exclusively applies to the armed forces of the territorial State fighting an organized armed group that satisfies the requirements of AP II inside the borders of the territorial State based on her application of the rules of treaty interpretation to the Protocol's Article 1(1).Footnote ⁶⁶ Yoram Dinstein identifies the question as an outstanding issue, saying that “strictly speaking” the text of Article 1(1) “invites the conclusion that AP II is inapplicable” but that “[a] more lenient deciphering of Article 1(1), based on the spirit rather than the letter of the text”, would see AP II apply.Footnote ⁶⁷ A similar view has been expressed by Andrew Clapham, who states that “[f]rom a humanitarian perspective it makes no sense to deny the applicability of the protective measures in the Protocol to conflicts where the state is a party to the Protocol but the fighting takes place outside its borders”.Footnote ⁶⁸ However, he goes on to note that not all share this view and that this is an issue that could usefully be clarified.Footnote ⁶⁹

Notwithstanding the limited authority, I am of the view that the applicability of AP II to the ADF's operations in Afghanistan was clear.

As with any question of the proper interpretation of a treaty, the starting point must be Article 31(1) of the Vienna Convention on the Law of Treaties (VCLT).Footnote ⁷⁰ The general rule of treaty interpretation requires a treaty to be “interpreted in good faith in accordance with the ordinary meaning to be given to the terms of the treaty in their context and in the light of its object and purpose.” In concluding that AP II does not apply to intervening foreign forces, Bradley also starts with Article 31(1) of the VCLT. However, she only considers the meaning of the words “in” and “its” and the compound term “High Contracting Party” and relies on dictionary definitions of these terms, ignoring both other terms and phrases found in Article 1(1), and their context as that concept is defined in Article 31(2) of the VCLT.Footnote ⁷¹ Further, while Bradley opines that “[t]he specific purpose of this treaty is to offer protection to the victims of NIACs”, she does not take this object and purpose into account in identifying the ordinary meaning of the terms in Article 1(1). Rather, initially, she seems to conflate object and purpose with the circumstances of AP II's conclusion when she says (immediately after identifying the object and purpose):

Article 32 of the VCLT of course specifically refers to the circumstances of a treaty's conclusion, enabling this to be considered as a supplementary means of interpretation in order to confirm the meaning resulting from the application of Article 31, or to determine meaning when the Article 31 exercise leaves the meaning of treaty text ambiguous or obscure or leads to a result that is manifestly absurd or unreasonable – an aspect of the rules of treaty interpretation not canvassed by Bradley. Bradley does revisit the object and purpose of AP II in a later section of her article dedicated to an examination of the territorial scope of AP II in the context of spillover conflicts: here she states that “[a] humanitarian approach or purposive approach from a humanitarian perspective would interpret a provision of a relevant IHL treaty as offering greater protection to the victims of NIACs”.Footnote ⁷³ She thus concedes that “the purposive or humanitarian approach to the territorial requirement of Additional Protocol II” supports the reading that the Protocol has extraterritorial effect.Footnote ⁷⁴ She concludes, however, that “the consideration of the object and purpose of a treaty cannot be used to counter a clear substantive provision”, and she asserts that Article 1(1) “clearly determines” a restrictive interpretationFootnote ⁷⁵ – a matter that, as noted above, her article does not in fact convincingly establish. Finally, Bradley asserts that the drafting history of AP II confirms her preferred interpretation, although the only authority she provides in support of this assertion is a footnoted citation referencing a single document in the travaux: neither its content nor its relationship to her preferred interpretation is provided.Footnote ⁷⁶ A review of the document cited, a Brazilian proposal to amend Article 1(1), sheds no light on the interpretive issue at hand given that it does not address the question of whether or not AP II was intended to have extraterritorial effect.Footnote ⁷⁷ For all of these reasons, I would submit that the interpretive exercise engaged in by Bradley is lacking in a number of respects and, as such, is not compelling.Footnote ⁷⁸

Indeed, I would suggest that a rigorous application of Article 31(1) of the VCLT to Article 1(1) of AP II in fact leads to the opposite conclusion. Article 1(1) of AP II requires, inter alia, that one of the parties to the armed conflict in question be the armed forces of the State, and that the opposing dissident armed forces or organized armed group(s) meet requirements relating to responsible command, and control of territory. To read the reference to the host State and the dissident armed force/organized armed group as not only threshold requirements but also an exhaustive list of the parties to such a conflict that are bound to apply AP II would require those references to do double duty, and would ignore the conjunctive “and” that follows the reference to AP I. For this reason, the better view is that a good-faith interpretation of Article 1(1), in accordance with the ordinary meaning of its words, provides that the Protocol applies to all armed conflicts that meet the threshold requirements set out in Article 1(1). In other words, the requirement that an armed conflict involve the armed forces of the High Contracting Party in whose territory the conflict takes place should be viewed as a threshold requirement, and not as a factor that excludes the application of the Protocol to the armed forces of foreign States participating in the NIAC alongside the armed forces of the host State. Put another way, if AP I does not apply, and if an armed conflict is taking place on the territory of a High Contracting Party between its armed forces and organized armed groups that meet the requisite threshold tests, then AP II applies to “the armed conflict” as a whole. This means that the words “shall apply to all armed conflicts” are determinative, such that a State which is party to AP II and which intervenes in an AP II NIAC on the territory of another State Party is bound to apply the Protocol's rules.

A reference to the object and purpose of AP II supports this interpretation. The preamble to AP II confirms that one of its key objectives is to “ensure a better protection for the victims of those armed conflicts”. Clearly, adherence to AP II by all High Contracting Parties participating in a NIAC would best enable the Protocol's object and purpose to be met. A contrary interpretation would lead to a lacuna in the coverage of armed conflicts by AP II and would mean that foreign armed forces operating in the territory of another State would be bound to apply a different standard of IHL than if they were operating on their own territory, which would sit in tension with the limitations international law generally places on the conduct of foreign States in a host State's territory. It would also mean that the ANSAs party to the conflict would owe different obligations to host State armed forces compared to those of an intervening foreign State, which would raise serious practical challenges in relation to the ability of such ANSAs to distinguish between different forces.Footnote ⁷⁹ An additional implication would be that host State armed forces and foreign armed forces would more frequently be operating under different rules of IHL, which may pose significant challenges in relation to interoperability and raise sensitivities on the part of a host State. It could even produce the undesirable result of a host State delegating certain functions (such as those relating to detention) to foreign States in order to avoid AP II obligations.

It might be argued that had a broad interpretation of Article 1(1) been intended, it would have been open to the drafters to frame the provision in similar terms to CA3, which merely requires that the conflict take place “in the territory of one of the High Contracting Parties”. Indeed, if we turn to the travaux préparatoires of AP II under Article 32 of the VCLT, it can be seen that the original draft of Article 1, prepared by the ICRC and provided to the Diplomatic Conference, would have given AP II broader application:

From the outset of negotiations, Article 1 received close attention from States. Thirteen written proposals to amend Article 1 were tabled during the Diplomatic Conference,Footnote ⁸¹ four of which would arguably have omitted the words that Bradley (and impliedly others) argue prevent AP II's extraterritorial application.Footnote ⁸² The draft article, together with these proposed amendments, was considered by Committee I, which, after receiving initial views from States, sent it to Working Group B for consideration. Working Group B “spent the greater part of 15 meetings discussing article 1”, before establishing a Sub-Working Group to carry out informal consultations with a view to agreeing a text for the article.Footnote ⁸³ The version that emerged from the Sub-Working Group on 17 March 1975 remained unchanged until its final adoption by the Diplomatic Conference.Footnote ⁸⁴

Nothing in the negotiating history of what became Article 1(1), including the rejection of the four proposals that would have omitted explicit references to the territory of a High Contracting Party, can be said to exclude AP II's extraterritorial application. As the ICRC's commentary to Article 1(1) notes, the provision was “the result of a delicate compromise, the product of lengthy negotiations, and the fate of the Protocol as a whole depended on it”.Footnote ⁸⁵ The travaux préparatoires plainly demonstrate that the purpose of the restrictions added by States to the draft of Article 1(1) prepared by the ICRC, including the insertion of specific references to territory, was to restrict the situations of armed violence that qualified as armed conflict for the purpose of the Protocol to situations that were comparable to IAC, and to achieve this by the use of criteria that could be objectively applied.Footnote ⁸⁶ As noted at the outset, this reflected the majority's concerns about the sovereignty implications of the application of IHL to NIACs. There is no evidence of any intent to exclude the Protocol's application to foreign States intervening in NIACs. Indeed, had this been intended, an express exclusion, or clearer confinement of the application of the Protocol, could, and arguably would, have been included – or at the very least would have been explicitly canvassed in the extensive travaux generated by AP II's negotiation.

In requiring the dissident armed force or organized armed group to have the capacity to implement AP II as a precondition for the applicability of AP II, it is clear that the notion of reciprocity is fundamental to the material scope of application (notwithstanding the fact that actual implementation is not required). Thus, in favour of a narrow interpretation of Article 1(1), it could be argued that visiting forces operating on the sovereign territory of another State would be unable to meet some of the obligations set out in the Protocol. It is submitted, however, that this would be an unconvincing objection. The majority of AP II provisions relate to obligations to protect and respect protected persons and objects. It is, for example, difficult to argue that the fundamental guarantees owed under Article 4, or the obligations to respect and protect medical and religious personnel under Article 9, or the prohibition on the punishment of persons for having carried out medical activities under Article 10, cannot be met because a party to an armed conflict is a visiting force. Positive obligations, such as those owed to persons whose liberty has been restricted, are explicitly caveated by the statement that the parties to the armed conflict need to respect the obligations “within the limits of their capabilities”.Footnote ⁸⁷ Similarly, obligations such as the obligation to take all possible measures to search for and collect the wounded, sick and shipwrecked are limited by the phrase “whenever circumstances permit”.Footnote ⁸⁸ Taking these caveats into account, it is not sustainable to argue that a narrow interpretation of Article 1(1) is militated by the idea that visiting armed forces are unable to apply AP II's provisions.

For the foregoing reasons, the better view is that AP II applies to a foreign State party to AP II intervening in a qualifying NIAC on the territory of another AP II State Party. As such, the Protocol applied to the ADF in Afghanistan as a matter of treaty law. One complicating factor in the Afghan context is that Afghanistan only acceded to AP II on 10 November 2009, with the treaty entering into force for it on 10 May 2010. It is thus only from this date that Australia was bound to apply the provisions of AP II as a matter of treaty law. As noted above, the scope of the IGADF Inquiry was 2005 to 2016, but it seems likely that Australia ceased to be a party to the armed conflict at the end of 2013, meaning that the ADF was bound by AP II as a matter of treaty law for only part of the Inquiry's temporal jurisdiction. In this context it should be noted that a chronology of investigated incidents included in the Brereton Report indicates that these incidents fell within the period 2006–13, but that the overwhelming majority date from 2010–13,Footnote ⁸⁹ during which the ADF was bound by AP II.

Why the Brereton Report's silence on the applicability of AP II matters

The primary reason why it is important to be clear that AP II applied to the ADF's operations in Afghanistan from May 2010 as a matter of treaty law is because the customary status of the various provisions of AP II is subject to debate. While it is widely agreed that the “core” of AP II now forms part of customary international law,Footnote ⁹⁰ precisely which rules from AP II have achieved customary law status is less clear. Acknowledging that Australia was bound by all of the Protocol's rules removes room for debate over key IHL obligations.

It is acknowledged that during the period when IHL applied to the ADF's operations in Afghanistan, ADF personnel were subject to Subdivisions F and G of the Commonwealth Criminal Code irrespective of the applicability of AP II as a matter of treaty law. However, the IGADF's mandate was not limited to an investigation of criminal conduct: the IGADF was directed by the Chief of the Defence Force to inquire whether there was any substance to rumours of criminal or unlawful conduct on the part of the ADF SOTG deployments in Afghanistan.Footnote ⁹¹ Moreover, as the ICRC has noted,

One would certainly hope that the identification of credible information to suggest that war crimes had been committed would give rise to consideration as to whether any applicable laws of IHL, the violation of which does not attract individual criminal responsibility, were also violated. Consideration of this issue is critical to Australia and Afghanistan's relationship, noting that a serious breach of IHL would likely incur Australia's State responsibility. A review of the ADF's observance of IHL in Afghanistan is also critical to the broader review of the ADF's organizational culture. Adherence to the laws of war is not only a binding obligation, it is central to military honour and the maintenance of morale, and it is critical to mission success: if a State does not obey the laws of war, it risks losing local support for peace-building missions such as those in Afghanistan, and such operations cannot succeed without local support. When a military operation is mandated to help restore the rule of law and members of that operation breach the rules, it threatens the legitimacy of such operations, which could have significant geopolitical implications, in addition to posing a critical threat to military effectiveness.

It could be that the IGADF found no credible evidence of ADF violations of the rules of AP II (or customary international law) in Afghanistan – but one would have more confidence in this regard had the Brereton Report squarely addressed the issue.

Separate from the specific context of the inquiry into the ADF's operations in Afghanistan, it is important for States to put their views regarding the applicability of AP II on the public record. There are three reasons for this. First, AP II's application is reciprocal: making it clear when States are bound to apply AP II will benefit those personnel who are deployed overseas to fight in AP II conflicts by ensuring that their rights under the Protocol are promoted, enhancing the prospect of those rights in turn being respected.

Second, the publication of States’ views on the proper interpretation of IHL treaties is critical to building a consistent and shared interpretation of those treaties by other States, as well as international courts and tribunals. As I have argued in detail elsewhere,Footnote ⁹³ contemporary military operations pose a host of unresolved IHL questions. As noted above,Footnote ⁹⁴ the vacuum created by State silence in relation to such questions is being filled by other actors. To ensure that IHL continues to reflect the views of States and, consequently, is seen as relevant by States, which is critical to maintaining and enhancing compliance with IHL's rules by both States and ANSAs, it is necessary for States to put their views on the law on the record.

Third, the explanation of a State's views on applicable international law is a significant component of any assessment of the legitimacy of that State's actions. This fact has not been lost on Australia. George Brandis, the former Australian Attorney-General, articulated this view in a lecture at the T. C. Beirne School of Law when he said: “It is vital that States (and their international legal advisers) have the courage to explain and defend their legal positions.”Footnote ⁹⁵ Picking up the central theme in Harold Koh's seminal article on “The Legal Adviser's Duty to Explain”,Footnote ⁹⁶ Brandis observed that explaining legal positions would strengthen our “culture of justification”Footnote ⁹⁷ by making “our legal deliberations more transparent, so that decisions are understood and respected – by Australians as well as by the international community”.Footnote ⁹⁸ As Brandis explained:

While Brandis’ remarks were made in the context of a speech setting forth Australia's interpretation of the meaning of imminence for the purpose of the exercise of the right of self-defence, they are of no less relevance in relation to a State's views on IHL. Indeed, consistent with the rationale expressed in Brandis’ lecture, while I was an Australian government legal adviser, I delivered a public presentation on the very issue of the applicability of AP II to foreign States intervening in AP II conflicts.Footnote ¹⁰⁰ The presentation outlined the reasons why Australian government legal advisers had reached the view that AP II does indeed apply. This makes the silence in the Brereton Report all the more surprising.