Gen. James N. Mattis takes the flag from outgoing acting commander Lt. Gen. John Allen. The incoming commander of U.S. Central Command Gen. James N. Mattis takes the flag signifying the assumption of command from outgoing acting commander Lt. Gen. John Allen (2nd from left) while Secretary of Defense Robert M. Gates looks on during an assumption of command ceremony at MacDill Air Force Base, Fla., on Aug. 11, 2010. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 688313-Q-HYG86-230.jpg Photo Gallery