So, the US troops are terrorists.
Doolittle, The US kills innocent people, but it is not done "indiscriminately"
So, it is OK to kill innocent people as long as it is done with discrimination, rather than without discrimination. But if the US troops are killing innocents with discrimination, as you are suggesting, than they can tell the difference between innocent and "enemy combatant". So, they kill innocents because they know they are innocents.