Please answer the following question: The Grumman F3F was the last American biplane fighter aircraft delivered to the United States Navy and served between the wars. Designed as an improvement on the single-seat F2F it entered service in 1936. It was retired from front line squadrons at the end of 1941 before it could serve in World War II and was first replaced by the Brewster F2A Buffalo. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Mean Of Transportation