Flight Lieutenant William Collins, Royal Air Force, troubleshoots an avionics system on an F-16 Fighting Falcon in preparation for a test mission at Holloman AFB, New Mexico, February 18, 2021. Flt. Lt. Collins is an exchange officer assigned as a test pilot to the 96th Test Wing at Eglin AFB, Florida. (U.S. Air Force photo by Master Sgt. Tristan McIntire)