Question: What is the name of a medium-lift helicopter used in military and civilian applications, and which is used by the Canadian forces as an air-sea rescue vehicle?
Context: The Douglas C-54 Skymaster was a four-engined transport aircraft used by the United States Army Air Forces in World War II and the Korean War.  Like the Douglas C-47 Skytrain, the C-54 Skymaster was derived from a civilian airliner, the Douglas DC-4.  Besides transport of cargo, the C-54 also carried presidents, prime ministers, and military staff.  Dozens of variants of the C-54 were employed in a wide variety of non-combat roles such as air-sea rescue, scientific and military research, and missile tracking and recovery.  During the Berlin Airlift it hauled coal and food supplies to West Berlin.  After the Korean War it continued to be used for military and civilian uses by more than 30 countries.  This was one of the first aircraft to carry the President of the United States. Air-sea rescue (ASR or A/SR, also known as sea-air rescue ) is the coordinated search and rescue (SAR) of the survivors of emergency water landings as well as people who have survived the loss of their seagoing vessel.  ASR can involve a wide variety of resources including seaplanes, helicopters, submarines, rescue boats and ships.  Specialized equipment and techniques have been developed.  Military and civilian units can perform air-sea rescue. The Bertram class was a two-ship class of air-sea rescue vessels of the Royal Australian Navy.  Purchased to replace the old World War II class of 63-foot air-sea rescue vessel, they were found to be unsuitable for the proposed role.  The vessels were subsequently employed as harbour personnel carriers and based at HMAS "Waterhen" .  The vessels were disposed of in 1988. The CANT Z.506 "Airone" (Italian: Heron) was a triple-engine floatplane produced by CANT from 1935.  It served as a transport and postal aircraft with the Italian airline "Ala Littoria".  It established 10 world records in 1936 and another 10 in 1937.  During World War II it was used as a reconnaissance aircraft, bomber and air-sea rescue plane, by the Italian "Regia Aeronautica" and "Regia Marina", Aeronautica Cobelligerante del Sud, Aeronautica Nazionale Repubblicana and the "Luftwaffe".  The military version revealed itself to be one of the best floatplanes ever built.  Despite its wooden structure it was able to operate in very rough seas.  A number of Z.506S air-sea rescue aircraft remained in service until 1959. The AgustaWestland CH-149 Cormorant is the Canadian Forces designation for the AgustaWestland AW101 (formerly EH101), a helicopter used for air-sea rescue in Canada.  Developed as a joint venture between Westland Aircraft in the UK and Agusta in Italy (now merged as Leonardo), the CH-149 is a medium-lift helicopter for military applications. The AgustaWestland AW101 is a medium-lift helicopter used in both military and civil applications.  It was developed by a joint venture between Westland Helicopters in the United Kingdom and Agusta in Italy in response to national requirements for a modern naval utility helicopter.  Several operators, including the armed forces of Britain, Denmark, Norway and Portugal, use the name Merlin for their AW101 aircraft.  It is manufactured at factories in Yeovil, England and Vergiate, Italy; licensed assembly work has also taken place in Japan and the United States. An amphibious helicopter is a helicopter that is intended to land in and take off from both land and water.  Amphibious helicopters are used for a variety of specialized purposes including air-sea rescue, marine salvage and oceanography, in addition to other tasks that can be accomplished with any non-amphibious helicopter.  An amphibious helicopter can be designed with a waterproof or water-resistant hull like a flying boat or it can be fitted with utility floats in the same manner as a floatplane. No. 113 Air-Sea Rescue Flight was a Royal Australian Air Force unit of World War II.  The Flight was formed at Cairns, Queensland on 10 January 1945 and was equipped with PBY Catalinas for air-sea rescue operations.  The Flight conducted its first operational missions in February, providing support for Allied air strikes and making supply drops.  The flight departed Australia for Morotai in the Netherlands East Indies in late February, and became operational there in early March.  From Morotai the Flight continued in its rescue and transport roles and also began flying missions behind Japanese lines in support of the Allied Intelligence Bureau (AIB). Helicopter Sea Combat Squadron 22 (HSC-22) is a United States Navy helicopter squadron based at NAS Chambers Field (KNGU) in Norfolk, Virginia.  The "Sea Knights" were Established on September 29, 2006, and have multiple missions including vertical replenishment, search and rescue, air-sea rescue and anti-surface warfare.  The Sea Knights fly the MH-60S helicopter, manufactured by Sikorsky Aircraft in Stratford, Connecticut.  It is the first new helicopter squadron at Naval Station Norfolk in 22 years.  HSC-22 is the sister squadron of HSC-23 "Wild Cards" stationed at Naval Air Station North Island in Coronado, California. No. 112 Air-Sea Rescue Flight was a Royal Australian Air Force unit of World War II.  The Flight was formed at Darwin, Northern Territory on 23 December 1944 and was equipped with PBY Catalinas.  The Flight's role was to carry out search and rescue operations as well as air-sea rescue support to other aircraft during attacks on Japanese targets.
Answer: AgustaWestland AW101