From right, Senior Master Sgt. Thomas Arns, of the 527th Space Aggressor Squadron, cracks a smile while undergoing proficiency training given by Capt. Brian Goodman at Nellis Air Force Base, Nev., during exercise Red Flag 16-3, July 20, 2016. Red Flag is aimed at teaching service members how to integrate air, space and cyberspace elements. (U.S. Air Force photo/Tech. Sgt. David Salanitri)