ACTING COMMANDER Army Lt. Gen. Martin Dempsey, acting commander of U.S. Central Command, addresses the audience as Navy Adm. William J. Fallon, left, outgoing commander of U.S. CENTCOM, Defense Secretary Robert M. Gates, center, and Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, right, look on during a ceremony on MacDill Air Force Base, Fla., March 28, 2008. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 835473-F-MTB09-785.jpg Photo Gallery