A U.S. Air Force Lockheed U-2D (s/n 56-6951) from the 4028th Strategic Reconnaissance Squadron at Bien Hoa Air Base, Vietnam, in early 1965. For security reasons, U-2s were rarely seen outside of their hangars. Note the Vietnamese Douglas A-1H <i>Skyraider</i>s and USAF Martin B-57B <i>Canberra</i>s in the background.<br>The U-2D 56-6951 crashed on 19 October 1966 on the runway at Davis Monthan AFB, Arizona (USA),  during a practice approach and landing. The pilot survived without injury.
USAF
<a rel="nofollow" class="external text" href="http://www.afhso.af.mil/">U.S. Air Force Historical Studies Office</a> publication <a rel="nofollow" class="external text" href="http://www.afhso.af.mil/shared/media/document/AFD-100526-034.pdf">Gradual Failure: The Air War over North Vietnam 1965-1966 (AFD-100526-034)</a> p. 114; <a rel="nofollow" class="external text" href="http://www.nationalmuseum.af.mil/photos/index.asp">National Museum of the U.S. Air Force</a> photo <a rel="nofollow" class="external text" href="http://www.nationalmuseum.af.mil/shared/media/photodb/photos/2014%5C01%5C140113-F-DW547-024.jpg">140113-F-DW547-024</a>