Thomas Fleener is a military officer and lawyer. Fleener, a major in the United States Army Reserve, has been appointed to serve as a defense lawyer in the Guantanamo military commissions. He has been appointed to serve as the defense lawyer for Ali Hamza Ahmed Sulayman al Bahlul. Though Al Bahlul has consistently insisted that he wants to represent himself or be represented by a Yemeni attorney, the United States Defense Department's Office of Military Commissions ruled that military defense counsel must represent defendants according to military commission rules.