U.S. Marine Corps Sgt. Joshua DeBoer mans a machine gun. U.S. Marine Corps Sgt. Joshua DeBoer mans a machine gun in the back of a MV-22B Osprey aircraft while flying over Iraq on Oct. 18, 2007. DeBoer is a crew chief with Marine Medium Tiltrotor Squadron 263. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 243013-H-EHX21-720.jpg Photo Gallery