That's not what the trials are for. Despite how people are reading what the M.O. says, those charged could still file a claim that they are not subject to the Military Tribunals by virtue of some law, as the German men during WWII did, and have standing otherwise, which claim would be addressed by the appropriate court. The trials are to determine if war-crimes were committed. War-crimes, like committing or being part of espionage and Acts of War without being in uniform.