A U.S. Air Force C-130 Hercules aircraft assigned to the 374th Airlift Wing departs Andersen Air Force Base, Guam, during the 62nd annual Operation Christmas Drop Dec. 11, 2013. Christmas Drop started in 1952 as a training mission and has since become the longest-running Department of Defense mission in full operation as well as the longest-running humanitarian airlift in the world.