A court-martial (plural courts-martial) is a military court. These military courts can etermine punishments for members of the military subject to military law who are found guilty or may dismiss the charges based on the evidence and the case presented. Virtually all militaries maintain a court-martial system to try cases in which a breakdown of military discipline may have occurred. In addition, courts-martial may be used to try enemy 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 army's own soldiers. Additionally, most navies have a standard court martial which convenes whenever a ship is lost; this does not necessarily mean that the captain is suspected of wrongdoing, but merely that the circumstances surrounding the loss of the ship would be made part of the official record. Many ship captains will actually insist on a court-martial in such circumstances.