I don't know about your military training but mine never involved a "green light" for indiscriminate killing. Here's the deal, one of the symptoms of PTSD is that you may very well stop seeing others as human. It's a defense mechanism. When the brain has trouble processing abominable things it quite often simply shuts off that function. Some people have this symptom to a greater degree than others and shit like posing with bodies, taking "trophies", etc. become the result. It's an ugly part of life but it happens. Based on the tiny bit of information we have on this issue I would certainly suggest that these young men be yanked out of combat and, after a court martial, be given treatment in confinement. This, from the facts presented, was probably murder under Article 118(3) of the UCMJ and should be punished as such. I couldn't say, based on what I have read, whether the crime rises to the level where capital punishment could be considered.