Airman 1st Class David Buchanan, 728th Air Mobility Squadron Operating Location-Alpha crew chief, carries a liquid oxygen converter removed from C-17 Globemaster III Feb. 21, 2013, at Transit Center at Manas, Kyrgyzstan. By performing routine maintenance and needed repairs, Airmen from the 728 AMS OL-A keep the C-17 ready to support airlift and onward movement. (U.S. Air Force photo/Staff Sgt. Stephanie Rubi)