Air Force Tech. Sgt. Sheron Mason and Staff Sgt. Jessie McCarley, from the 121st Fighter Squadron’s Aircrew Flight Equipment section, inspect night vision equipment for a night-flying exercise at Davis-Monthan Air Force Base, Tucson, AZ, November 21, 2009. The 121FS, D.C. Air National Guard, is receiving two weeks of training in preparation for an upcoming Aerospace Expeditionary Force deployment in 2010. (U.S. Air Force photo by Staff Sgt. Gareth Buckland/Released).