Master Sgt. Robert Cortez, 34th Aircraft Maintenance Unit assistant flight chief, performs an inspection of a B-1 bomber bomb bay during the Phase I Operational Readiness Exercise at Ellsworth Air Force Base, S.D., March 14, 2012. The pre-flight inspection ensures the aircraft is combat ready. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)