This sounds a little far out there. I know Bush-Cheney are evil assholes, but to put a hit on a soldier in a warzone and make it look like an accident is not that hard, even those assholes could have come up with a better plan than shooting him in the forehead from 10 feet away. It sounds more like someone really got pissed, like he was bullying someone and they went off. If what I've read of Tillmans abusive nature towards a weaker individual (bullying) is true, I can see how someone in a war zone carrying an M-16 could just lose it and pop him. Then not wanting the public to know about this behavior, they covered it up.