Three F-16 Fighting Falcon pilots with the 421st Fighter Squadron at Hill AFB, Utah, fly in formation over the Nevada Test and Training Range on 20 July 2012, during Red Flag 12-4. Red Flag is an advanced aerial combat training exercise held at Nellis AFB, Nevada, four-to-six times a year to train pilots from the US, NATO, and other allied countries in realistic air-to-air combat.
