The Stinson L-5 Sentinel was the military version of the commercial Stinson 105 Voyager. Six Voyagers were bought by the USAAF in 1941 as YO-54s for testing, and quantity orders for Sentinels began in 1942, at first as O-62s before the designation was changed to 'L' for liaison in April 1942. Between 1942 and 1945, the USAAF ordered 3590 L-5s. The unarmed L-5 with its short field take-off and landing capability was used for reconnaissance, removing litter patients from frontline areas, delivering supplies to isolated units, laying communications wire, spotting enemy targets for attack aircraft, transporting personnel, rescuing Allied personnel in remote areas and even as a light bomber. In Asia and the Pacific, L-5s remained in service with US Air Force units as late as 1955.