Jillian, how, as a practical matter, could you possibly try them? Chain of Evidence on the battlefield? What? Soldiers aren't trained for that.
Maybe in some circumstances where one of the guys is grabbed by the FBI or something, then you could try him. But people that were captured on the battlefield, there would be no, or next to no, evidence that would stand up in court mostly because nobody was concerning with preserving the integrity of evidence or ensuring the proper handling of evidence.
Further, what rights should properly be accorded to terrorists according to the Geneva convention?
However,
here is a somewhat persuasive argument they should be treated as POWs In this case they would not be tried and would not be released until a cessation of hostilities entitles them to repatriation.