An F-15 Strike Eagle aircraft from Seymour Johnson Air Force Base, N.C., takes off May 4 at Hill AFB, Utah. The 86th Fighter Weapons Squadron, a Hill tenant unit, is conducting the U.S. Air Force air-to-ground weapons evaluation known as Combat Hammer to test and validate the performance of crews, pilots and their technology while deploying precision-guided munitions. (U.S. Air Force photo by Paul Holcomb)