This was the real jet-age seaplane, it was not the slow awkward lumbering seaplane of piston engine days. It was capable of over 1000 kph and was designed to live in the water for months at a time. The first Navy prototype first flew in 1955. Four years of testing led to the first production model, flown in early 1959. Later that year the program was cancelled and Martin got out of the airplane business, focusing on electronics and missiles instead. Twelve examples were built, none survive.