Martin E. Dempsey (born March 14, 1952) is a United States Army general and the 18th and current Chairman of the Joint Chiefs of Staff. He previously served as the 37th Chief of Staff of the Army from April 11, 2011, to September 7, 2011. Prior to that, he served as Commanding General, U.S. Army Training and Doctrine Command, from December 8, 2008, to April 11, 2011, as Acting Commander, U.S. Central Command, from March 24, 2008, to October 30, 2008, as Deputy Commander, U.S. Central Command, from August 2007 to March 23, 2008, and as Commanding General, Multi-National Security Transition Command – Iraq (MNSTC-I), from August 2005 to August 2007. As the Chairman of the Joint Chiefs of Staff, Dempsey is currently the highest-ranking military officer in all of the United States Armed Forces.