Pilots from Sweden’s 172nd Fighter Reconnaissance Squadron walk away from their JAS-39 Gripen fighter jets after landing at Nellis Air Force Base, Nev., to participate in Red Flag 13-2 Jan. 17, 2013. The exercise is hosted north of Las Vegas on the Nevada Test and Training Range, which has more than 12,000 square miles of airspace and 2.9 million acres of land; with 1,900 possible targets, realistic threat systems and an opposing enemy force that cannot be replicated anywhere else in the world. (U.S. Air Force photo by Senior Airman Daniel Hughes/Released)