Whatever might be the outer bounds of this category of covered persons, Common Article 3 does not alter the fundamental law of war principle concerning a belligerent party's right in an armed conflict to target individuals who are part of an enemy's armed forces or eliminate a nation's authority to take legitimate action in national self-defense. The language of Common Article 3 "makes clear that members of such armed forces [of both the state and non-state parties to the conflict]... are considered as 'taking no active part in the hostilities' only once they have disengaged from their fighting function ('have laid down their arms') or are placed hors de combat; mere suspension of combat is insufficient." International Committee of the Red Cross, Interpretive Guidance on the Notion of Direct Participation in Hostilities Under International Humanitarian Law 28 (2009). An operation against a senior operational leader of al-Qa'ida or its associated forces who poses an imminent threat of violent attack against the United States would target a person who is taking "an active part in hostilities" and therefore would not constitute a "grave breach" of Common Article 3
