There are various other requirements for them to qualify, such as wearing a uniform
That requirement is not in the conventions anywhere. It was invented by Muller (Gestapo boss) on personal Hitler orders in the directive which he issued as a justification for shooting SAS infiltrators in France on the spot in WW2.
having a proper chain of command which has been announced publicly I do not recall that one in any of the conventions either.
Moreover, nothing in the Conventions prohibits killing the enemy - it just means they have to be treated properly if and when they surrender or are otherwise rendered unable to fight.
My exact point.
1. Blanket torture via waterboarding does not fit that.
2. We presently subject any of the captives to a trial for killing or trying to kill one or more of "our guys". If we are at war, them doing so is a case of "A la guerre comme a la guerre". They are entitled to do it same as we are. If we are in a police action we should stop calling it a war and get the relevant justification for spot-on executions in a police action.