Tech. Sgt. Andrew Dunn conducts a pre-flight maintenance inspection on a C-17 Globemaster III March 12, 2011, at Joint Base Pearl Harbor-Hickam, Hawaii, before departing on a humanitarian mission to Japan. The plane will visit various Air Force bases in Japan during its mission to provide support for Japan relief efforts in the wake of tsunami and earthquake damage there. Sergeant Dunn is a crew chief with the 15th Aircraft Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Nathan Allen)