The 03U-2 was an upgraded 03U-1.  The first five retained the 03U-2 designation, but the remainder were designated SU-1 and flown by the Marines.  Only the landplane version of this model was produced.

While the O3U-1 was being produced, Vought proposed a follow-on O3U-2 which incorporated several major changes.  The most apparent was the use of the latest P&W R1690 Hornet (565/600 hp) engine and a new, rounder fin.  The Navy ordered 29, but since this batch of aircraft was delivered to the Marine Corps, the designation was changed to SU-1 to reflect the Marine scouting mission.  The Marines operated the SU-1’s from the decks of the USS Lexington and the USS Saratoga, thereby becoming the first Marine aircraft to operate from an aircraft carrier.