Ok, I see what I did now and why you were confused. My post not correct. I said “The United Nations has a specific definition in Article 2.” That’s not right, and I was actually referring to Art. 2 of the GC.
It’s the gold standard in the sense that you don’t the GC without passing through Article 2 (or, being in an “armed conflict”).
In that same post, I also said there are non-international “armed conflicts” (Article 3 of the GC). Before 9/11, a terrorist attack had not, could not, be an “armed conflict.” It was neither an inter-state conflict (Art. 2) nor an intra-state conflict (Art. 3). It was only a criminal act.
That appears to be changing since 9/11 and it’s unprecedented. As I mentioned, the UN, NATO, Congress, and President all said we were at war/armed conflict with a terrorist organization (criminals). It’s a shift away from law enforcement of terrorism and an endorsement towards a military means to fight terrorism.
If it’s an “armed conflict” then the laws of war apply and the terrorists can (and will be) tried by military commissions and/or tried for war crimes. Again, previously criminals are not tried for war crimes, but if they are now “enemies” fighting against us, they can be.
It’s a big deal and Obama appears to have endorsed the “we’re at war” concept.