Master Sgt. Michael O’Brien signs a photograph of a C-17 Globemaster III aircraft for a family during the Marine Corps Air Station Yuma Airshow March 17, 2012. During the airshow, Sergeant O’Brien spent time educating airshow visitors about the aircraft, posing for photographs, signing autographs, and answering questions. More than 60,000 visitors attended the MCAS Yuma Airshow. Sergeant O’Brien is a loadmaster with the 701st Airlift Squadron at Joint Base Charleston, S.C. (U.S. Air Force photo/Staff Sgt. Shane Ellis)