Capt. Derek Anderson, 494th Fighter Squadron pilot, and Maj. Reed Kastner, 494th Fighter Squadron weapons system officer, perform start-up checks on an F-15E Strike Eagle at RAF Lakenheath, England, March, 28, 2014. The 494th FS is participating in Exercise Tonnerre Lightning, which is a series of training exercises aimed at improving interoperability between the partner-nation air forces of the United Kingdom, France, and the U.S. (U.S. Air Force photo by Airman 1st Class Nigel Sandridge/Released)