Douglas X-3 Stiletto (1953); researching features needed to sustain supersonic speeds for NACA, Air Force and Navy. Unlike X-1 and X-2, X-3 was capable of ground take-off as opposed to being dropped from a mother plane.
An F-15E Strike Eagle from the 391st Expeditionary Fighter Squadron pops flares during an aerial training dog fight. The 391st EFS are deployed in Guam from Mountain Home Air Force Base, Idaho, on a rotational basis supporting the U.S. Air Force's continued presence in the Western Pacific. (U.S. Air Force photo/Technical Sgt. Cecilio Ricardo) via Flickr