commercial satellite communications, global positioning navigation, and weather radar systems. They also installed research equipment racks in what was once the plane's bomb bay. NASA's S-3B Viking was equipped to conduct science and aeronautics missions, such as environmental monitoring, satellite communications testing, and aviation safety research. Operators United States Navy (former) VS-21 Red Tails (1975-2005) VS-22 Checkmates (1976-2009) VS-24 Scouts (1977-2007) VS-27 Seawolves/Grim Watchdogs (1987-1994) VS-28 Hukkers/Gamblers (1976-1992) VS-29 Dragonfires (1976-2004) VS-30 Diamond Cutters (1977-2007) VS-31 Topcats (1977-2008) VS-32 Maulers (1976-2008) VS-33 Screwbirds (1977-2006) VS-35 Boomerangers/Blue Wolves (1986-88/1991-2005) VS-37 Sawbucks (1978-1995) VS-38 Red Griffins (1978-2004) VS-41 Shamrocks (1974-2006) VQ-5 Sea Shadows (1991-1999) VQ-6 Black Ravens (1991-1999) VX-1 Pioneers (Unknown) NASA (former) Aircraft on display YS-3A 157993 – NAS Jacksonville Aircraft Heritage Park, NAS Jacksonville, Jacksonville, Florida. S-3A 159417 – Celebrity Row, Davis-Monthan AFB (North Side), Tucson, Arizona. ES-3A 159404 – Celebrity Row, Davis-Monthan AFB (North Side), Tucson, Arizona. S-3B 159387 – Navy One National Naval Aviation Museum, NAS Pensacola, Pensacola, Florida. 159412 – NAS North Island, San Diego, California. 159731 – at the Patriot's Point Naval and Maritime Museum, Charleston, South Carolina. 159743 – Aviation Wing of the Marietta Museum of History, Dobbins ARB (formerly Atlanta NAS), Atlanta, Georgia. 159755 – NAS Pensacola, Pensacola, Florida. 159766 – at San Diego, California. 159770 – Patuxent River Naval Air Museum, Lexington Park, Maryland. 160123 – Air Zoo at Kalamazoo, Michigan. 160599 – at the former NAS Alameda, Alameda, California. 160604 – Pima Air and Space Museum (adjacent to Davis-Monthan AFB), Tucson, Arizona. N601NA - NASA Viking San Diego Air & Space Museum, San Diego, California. Specifications (S-3A) See also References Citations Bibliography Elward, Brad E."Lockheed S-3 Viking and ES-3A Shadow." World Air Power Journal', Volume 34, Autumn–Fall 1998. , pp. 48–97. Francillon, René J. Lockheed Aircraft since 1913. London: Putnam, 1982. . Francillon, René J. Lockheed Aircraft Since 1913. Naval Institute Press, 1987. . Godfrey, David W. H. "Fixer, Finder, Striker: The S-3A Viking." Air International, Volume 7, Issue 1, July 1974, pp. 5–13. Michell, Simon. Jane's Civil and Military Upgrades 1994–95. Coulsdon, UK: Jane's Information Group, 1994. . Taylor, John W. R. Jane's All The World's Aircraft 1976–77. London: Jane's Yearbooks, 1976. . Winchester, Jim, ed. Military Aircraft of the Cold War (The Aviation Factfile). London: Grange Books plc, 2006. . "Viking Variations". Air International, Volume 31, Number 1, July 1986. pp. 41–45. External links S-3B Viking fact file and S-3