This was built as USAF, tail 0-10066, 37th RQS as flown over the Gulf of Tonkin for pilot rescue, based in Da Nang, South Viet Nam.
The majority of Grumman Albatrosses were used by the U.S. Air Force, primarily in the search and rescue mission role (SAR), and initially designated as SA-16. The USAF used the SA-16 extensively in Korea for combat rescue, where it gained a reputation as a rugged and seaworthy craft. Later, the redesignated HU-16B (long-wing variant) Albatross was used by the U.S. Air Force's Aerospace Rescue and Recovery Service and saw extensive combat service during the Vietnam War. In addition a small number of Air National Guard air commando groups were equipped with HU-16s for covert infiltration and extraction of special forces from 1956 to 1971. Other examples of the HU-16 made their way into Air Force Reserve air rescue units prior to its retirement from USAF service. (courtesy of Wikipedia)