NELLIS BRIEFING Deputy Defense Secretary Ash Carter, center left, receives a briefing on the F-35 joint strike fighter and F-22 aircraft from Air Force Maj. Gen. Jeffrey G. Lofgren, commander of the U.S. Air Force Warfare Center, and several pilots during his visit to Nellis Air Force Base, Nev., Nov. 6, 2013. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 403030-Q-NAK74-985.jpg Photo Gallery