ANDERSEN AIR FORCE BASE, Guam -- Tech. Sgt. Harper Douglas, 374th Maintenance Squadron crew chief, inspects a tire for wear on a C-130 Hercules in support of Operation Christmas Drop Dec. 18. Operation Christmas Drop, the longest running humanitarian airlift mission in the world, delivers supplies to remote islands of the Federated States of Micronesia - Yap, Palau, Chuuk and Pohnpei. (U.S. Air Force photo/Tech. Sgt. Kimberly Spinner)