The Grumman J2F Duck (company designation G-15) was an American single-engine amphibious biplane. It was used by each major branch of the U.S. armed forces from the mid-1930s until just after World War II, primarily for utility and air-sea rescue duties.
The J2F was used by the U.S. Navy, Marines, Army Air Forces, and Coast Guard; apart from general utility and light transport duties its missions included mapping, scouting/observation, anti-submarine patrol, air-sea rescue work, photographic surveys and reconnaissance, and target tug.
The J2F was an improved version of the earlier JF Duck, with its main difference being a longer float.
Info: Wikipedia
http://en.wikipedia.org/wiki/Grumman_J2F_Duck
Profile: American Aircraft Of World War II
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