VP-56, nicknamed the Dragons, was a long-lived Patrol Squadron of the U.S. Navy. It was originally established as Patrol Squadron VP-900 on 1 July 1946, redesignated Medium Patrol Squadron (Landplane) VP-ML-71 on 15 November 1946, redesignated VP-661 in February 1950, redesignated VP-56 on 4 February 1953 and disestablished on 28 June 1991. It was the second squadron to be designated VP-56, the first VP-56 was redesignated OTS on 1 July 1941.

The Martin PBM Mariner is a twin-engine American patrol bomber flying boat of World War II and the early Cold War era. It was designed to complement the Consolidated PBY Catalina and PB2Y Coronado in service. A total of 1,366 PBMs were built, with the first example flying on February 18, 1939, and the type entering service in September 1940, with the last of the type being retired in 1964.