Maintainers work on the left wingtip of a Vietnam War-era DHC-4 Caribou, operated by Flightworks Inc. at Bagram Airfield, Afghanistan, May 11, 2012. The charter aircraft drops supplies by parachute to special forces and other clandestine units deployed in hard-to-reach locations around Afghanistan, according to Air Force and Army officials at Bagram. Visible in the foreground are portions of the right wing and tail of an AC-130 gunship. AFA staff photo by John. A. Tirpak