Staff Sgt. Erick Vega, an avionics specialist with the 555th Fighter Squadron, attempts to figure out why the space systems on his F-16 Fighting Falcon aren't working correctly, while Chief Master Sgt. Tony Russell, a Red Flag Inspector General evaluator, observes during Red Flag 16-3 at Nellis Air Force Base, Nev., July 21, 2016. Airmen from the 527th Space Aggressor Squadron attempted to challenge Red Flag participants by posing attacks on space assets, simulating a potential attack by the enemy. (U.S. Air Force photo/Tech. Sgt. David Salanitri)