Martin JRM Mars

JRM Mars
JRM-2 Mars "Caroline Mars" in US Navy service
General information
Type	Flying boat
National origin	United States
Manufacturer	Glenn L. Martin Company
Status	Retired
Primary users	United States Navy (historical) Forest Industries Flying Tankers (FIFT) (historical) Coulson Flying Tankers (historical)
Number built	7
History
Manufactured	1945–1948
Introduction date	30 November 1943
First flight	23 June 1942
Retired	1956 (USN) 2024 (Civilian)
Developed into	Martin 193

The Martin JRM Mars is a large, four-engined cargo transport flying boat designed and built by the Martin Company for the United States Navy during World War II. It was the largest Allied flying boat to enter production, although only seven were built. The United States Navy contracted the development of the XPB2M-1 Mars in 1938 as a long-range ocean patrol flying boat, which later entered production as the JRM Mars long-range transport.

Four of the surviving aircraft were later converted for civilian use to firefighting water bombers. Two of the aircraft remained based at Sproat Lake just outside of Port Alberni, British Columbia, Canada, with one, Hawaii Mars, remaining in operation until 2016. The British Columbia Aviation Museum acquired Hawaii Mars and it was flown there in 2024. The same year it was announced that Philippine Mars would be acquired by the Pima Air & Space Museum in Tucson, Arizona, to be put on permanent display there.