Maj. Stephen Del Bagno, Thunderbird 4/Slot Pilot, awaits the signal to start the F-16 Fighting Falcon during a practice show at Nellis Air Force Base on March 14, 2018. Del Bagno was killed when his aircraft crashed on the Nevada Test and Training Range during a practice aerial demonstration on April 4, 2018. (Master Sgt. Christopher Boitz/U.S. Air Force)