Keywords: Patrol Squadron 21 (US Navy) insignia 1959.png Insignia of the U S Navy Patrol Squadron 21 VP-21 Black Jacks approved on 17 August 1959 Official U S Navy photo from the en Dictionary of American Naval Aviation Squadrons http //www history navy mil/research/histories/naval-aviation-history/dictionary-of-american-naval-aviation-squadrons-volume-2/chapter-3-patrol-squadron-vp-histories-3rd-vp-18-to-1st-vp-22 html Chapter 3 Patrol Squadron VP Histories 3rd VP-18 to 1st VP-22 p 123 from the U S Navy http //www history navy mil Naval History and Heritage Command 1959 U S Navy PD-USGov-Military-Navy PD-USGov-Military-Badge United States Navy patrol squadron emblems VP-021 Patrol Squadron 21 United States Navy |