The Grumman HU-16 Albatross is a large twin–radial engine amphibious flying boat that was used by the U.S. Air Force (USAF), the U.S. Navy (USN) and the U.S. Coast Guard (USCG), primarily as a search and rescue and combat search and rescue aircraft. Originally designated as the SA-16 for the USAF and the JR2F-1 and UF-1 for the USN and USCG, it was redesignated as the HU-16 in 1962.