U.S. Air Force Staff Sgt. Robert Strayer, 1st Operational Support Squadron aircrew flight equipment technician, attaches night vision goggles to a pilot’s helmet, during Red Flag 17-4 at Nellis Air Force Base, Nev., Aug. 24, 2017. While at RF, pilots fly daytime mission and night time missions to help keep current in all combat scenarios. (U.S. Air Force photo by Staff Sgt. Carlin Leslie)