The "D" model changed the landing gear to a nosewheel configuration. A civil four-seat version--the S-51--first flew in 1946 and was purchased by the U.S. Air Force as the H-5 and U.S. Navy as the HO3S.
This helicopter saw extensive action in Korea rescuing United Nations pilots shot down behind enemy lines and can be seen in the movie Bridges at Toko-Ri
U.S. soldiers shop at PX shop inside Kandahar airbase in Kandahar, Afghanistan, Tuesday, Oct. 22, 2002. The main task for the 4,500 soldiers, the Army's 82nd Airborne Division based at Afghanistan's largest base, is tracking down and capturing al-Qaida and Taliban stragglers in the country's dusty south. But while not at work, troops are getting to kick back in ever increasing style. They sleep in air conditioned comfort, have their haircut by female stylists flown in from Kyrgyzstan and will soon havea 24-hour cinema to catch the latest films. (AP Photo/Apichart Weerawong)
U.S. soldiers repair a helicopter at Kandahar air field in Kandahar, Afghanistan, Tuesday, Oct. 22, 2002. (AP Photo/Apichart Weerawong)
Kyrgyzstani hair stylists cut the hair of U.S. soldiers at PX barber shop inside Kandahar air field in Kandahar, Afghanistan (news - web sites), Tuesday, Oct. 22, 2002.(AP Photo/Apichart Weerawong)
U.S. soldiers work out during at a gym inside Kandahar air field in Kandahar, Tuesday, Oct. 22, 2002. (AP Photo/Apichart Weerawong)
Kyrgyzstani Kadyraly Ainura, manager of a PX barber shop, waits to welcome customers as her colleague cuts the hair of a U.S. soldier at her shop inside the Kandahar Air Field Tuesday, Oct. 22, 2002.(AP Photo/Apichart Weerawong)