U.S. Air Force Master Sgt. Robert Barrett, a loadmaster with the 300th Airlift Squadron, assists in unloading an MH-65C Dolphin helicopter, assigned to the U.S. Coast Guard, from a C-17 Globemaster III aircraft at Charleston Air Force Base, S.C., July 4, 2010. Airmen are conducting counter-drug and flight crew training missions during a five-day temporary duty assignment to El Salvador, Panama, Puerto Rico and the United States.