[ET(end tyranny)]

I am assuming it is the standard NATO (North Atlantic Treaty Organization) round developed to avoid all members from having incompatible ammunition and rifles.

I wondered if it had anything to do with NATO. But if its merely a universal ammo, then it couldn't be taken as 'degrading' NATO, just because its used.

[Lord Marshal]

I am assuming it is the standard NATO (North Atlantic Treaty Organization) round developed to avoid all members from having incompatible ammunition and rifles.

Yes, that is the case. IMO was chosen because it is one of the 3 most common rounds in the U.S. today. By using a very common round it's more difficult to track. Imagine trying to track all the AR-15 type rifles sold in the U.S.