Guantanamo prosecutor retires as controversial 9/11 trial remains distorted Sunday, 11 July 2021 2:05 AM [ Last Update: Sunday, 11 July 2021 2:05 AM ] In this Oct. 23, 2015 photo, U.S. Army Brig. Gen. Mark Martins, the chief prosecutor at the U.S. military commission at Guantanamo Bay, Cuba, speaks during a break in proceedings for the men charged with planning the Sept. 11 attack. (Photo by AP) The US Army general who spent the past decade leading the mostly mired efforts to prosecute five suspects held at the notorious Guantanamo Bay military prison and torture facility for alleged involvement in the September 11, 2001 terror attacks is reportedly retiring from the military.