[JURIST] The US Department of Defense (DOD) [official website] Thursday announced [press release] the appointment of Army Brig. General Mark Martins [official profile] as the new chief war crimes prosecutor at Guantanamo Bay [JURIST news archives] as head of the Office of Military Commissions [official website]. Martins, who is currently serving in Afghanistan as the commander of the Rule of Law Field Force, is a graduate of Harvard Law and former Rhodes Scholar. He replaces Navy Capt. John Murphy, a…