An F-16 Fighting Falcon from the 309th Fighter Squadron, Luke Air Force Base, Ariz., taxis to the runway during Green Flag-West 14-09 at Nellis AFB, Nev., Aug. 21, 2014. Green Flag exercises give visiting units the opportunity to train in air-to-ground combat operations. Many of the training exercise scenarios call for providing air support to ground troops who are participating in ground combat exercises. (U.S. Air Force photo by Airman 1st Class Thomas Spangler)