Photo: A U.S. Air Force A-10 Thunderbolt II close air support aircraft simulates its air to ground capabilities during the 2011 Aviation Nation Open House on Nellis Air Force Base, Nev., Nov. 12, 2011. Aviation Nation celebrates 70 years of airpower in Las Vegas and the Air Force’s accomplishments in air, space and cyberspace. (U.S. Air Force photo by Tech. Sgt. Bob Sommer)