Nellis Air Force Base, Nev., is one of the largest fighter bases in the world. Aircraft from Nellis operate on the Nevada Test and Training Range, which offers more than 15,000 square miles of airspace and 4,700 square miles of restricted land. More than 75 percent of all live munitions used by the Air Force for training are dropped on the Nevada Test and Training Range. From 100 feet above the ground to twice the speed of sound, Nellis conducts advanced combat training, performs operational test and evaluation, and develops tactics.