U.S. Air Force Airman 1st Class Frank Lopez recovers his equipment after filling the liquid oxygen tank on an F-16 Fighting Falcon aircraft on Bagram Airfield, Afghanistan, Jan. 6, 2016. Lopez is a crew chief assigned to the 455th Expeditionary Aircraft Maintenance Squadron, deployed from Hill Air Force Base, Utah. U.S. Air Force photo by Tech. Sgt. Robert Cloys