An F-35 Lightning II Joint Strike Fighter test aircraft banks over the flightline, sending contrails streaming off the wings, at Eglin Air Force Base, Fla., April 23, 2011. The aircraft was part of Northern Edge 2011 for the second time at Joint Base Elmendorf-Richardson, Alaska, June 13-24, 2011. (U.S. Air Force photo/Senior Airman Julianne Showalter)