Beginning in March 1942 the Coast Guard received the first of 76 Kingfishers; The Kingfishers were modified for Coast Guard use and were designated OS2U-3s. Their primary purpose was to provide the Coast Guard’s early anti-submarine efforts along the coastlines of the United States. Area patrols were flown and air cover for merchant convoys was provided.
The Coast Guard obtained six Chance-Vought O2U-2 Corsairs from the Navy Department’s inventory; three in 1934 and three more in 1935. They were modified at Eastern Air Service, Miami. The overhaul included removal of til hooks, installation of dual controls for the aft cockpit, installation of Coast Guard radios, and engine overhauls.