The Navy and Marine version of the L-5 through L-5E were designated OY-1, and all these aircraft has 12-volt electrical systems. The 24-volt L-5G became the OY-2. Neither the L-5G nor OY-2 saw combat during World War II because production did not begin until July, 1945, just weeks before the war ended, but they were used extensively during the Korean War. The British Royal Air Force (RAF) procured 40 L-5s and 60 L-5Bs, and designated them Sentinel Is and Sentinel II's respectively. These aircraft were used exclusively in the India-Burma theater of operations.