Master Sgt. James Frison teaches Air Force and Army personnel how to operate ground mobile vehicles inside the 527th Space Aggressors Squadron’s facility at Schriever Air Force Base, Colorado, Tuesday, July 11, 2016. The squadron supports and trains Army, Navy and internationally with other military forces to deal with GPS testing and satellite communication jamming. (U.S. Air Force photo/2nd Lt. Darren Domingo)