U.S. Air Force Airman Kacy Cotham, a crew chief assigned to the 510th Aircraft Maintenance Unit, Aviano Air Base, Italy, goes through post-flight procedures on an F-16 Fighting Falcon from the 31st Fighter Wing, Aviano AB, during Green Flag West 14-8, June 26, 2014, at Nellis Air Force Base, Nev. Green Flag West provides critical training to air and ground crews with scenarios to prepare them for future real-world missions. (U.S. Air Force photo by Airman 1st Class Thomas Spangler)