An F-16 Fighting Falcon assigned to the 64th Aggressor Squadron takes off from Nellis Air Force Base, Nev., to participate in a Joint Forcible Entry exercise over the Nevada Test and Training Range May 31, 2013. Under the Air Combat Command stand down that took effect June 1, the aggressors will be grounded through the end of the fiscal year. (U.S. Air Force photo/Senior Airman Daniel Hughes)