The SB2U-3 was a more heavily modified version, intended as a long-range scout bomber, capable of being fitted with a conventional wheeled undercarriage, for operations from aircraft carriers of land airbases, or with floats. To give the required increased range, the fuselage fuel tank fitted to the SB2U-1 and -2 was supplemented by integral wing tanks, while the aircraft's tail had an increased span. The prototype XSB2U-3, converted from the last SB2U-1, flew in February 1939, and after testing as both a landplane and floatplane, 57 SB2U-3s were ordered on 25 September 1939, mainly for the US Marine Corps.