CREW CHIEF A Marine Corps crew chief arms a machine gun on the rear of an MV-22 during a flight from Al Asad Air Base, Iraq, Nov. 22, 2007. The MV-22 carried Marine Corps Gen. James E. Cartwright, vice chairman of the Joint Chiefs of Staff, and USO entertainers to multiple stops in Iraq. SHARE: Download: Full Size (0.02 MB) Credit: VIRIN: 263806-W-HBB26-044.jpg Photo Gallery