A court-martial (plural courts-martial, as "martial" is postpositive) is a military court. A court-martial is empowered to determine the guilt of members of the armed forces subject to military law, and, if the defendant is found guilty, to decide upon punishment. In addition, courts-martial may be used to try prisoners of war for war crimes. The Geneva Convention requires that POWs who are on trial for war crimes be subject to the same procedures as would be the holding military's own forces.