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A U.S. Air Force F-16 Fighting Falcon fighter aircraft assigned to the 18th Aggressor Squadron takes off from Eielson Air Force Base, Alaska, Oct. 6, 2014, during RED FLAG-Alaska 15-1. RF-A is a series of Pacific Air Forces commander-directed field training exercises for U.S. and partner nation forces, providing combined offensive counter-air, interdiction, close air support and large force employment training in a simulated combat environment. (U.S. Air Force photo by Tech. Sgt. Joseph Swafford Jr./Released)

Jack and Lucy Cornwell, age 9 and 7, from Durham, N.C., watch the final liftoff of Space Shuttle Atlantis at the Smithsonian National Air and Space Museum in Washington, D.C., July 8, 2011.