Airman 1st Class Alexander McCall searches for discrepancies on top of a C-17 Globemaster III aircraft. U.S. Air Force Airman 1st Class Alexander McCall, a crew chief with the 315th Aircraft Maintenance Squadron, searches for discrepancies on top of a C-17 Globemaster III aircraft during an inspection at Charleston Air Force Base, S.C., on Nov. 4, 2009. Inspections are required for all C-17 aircraft to ensure operational integrity during flight. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 585407-R-UQG81-521.jpg Photo Gallery