The Grumman G-21 Goose is an amphibious aircraft, which means it can land and take off on water. It was designed as an eight-seat "commuter" plane for businessmen in the Long Island area. The Goose was Grumman’s first monoplane to fly. It was also Grumman's first twin-engined aircraft as well as their first aircraft to provide commercial service. During World War II, the Goose was used to transport the US military (including the Coast Guard). It served with many other air forces. During battles, the Goose took on an increasing number of combat and training roles. It was also used after the war.