Bell H-13 Sioux- Retired
- United States
- light observation helicopter
- developed from Bell 47
- OH-13S - three-seat observation helicopter based on 47G-3B to replace the OH-13H. 265 were built for U.S. Army. Also used by Australian Army.
- Sioux AH.1 - for the British Army, built by Agusta (Agusta-Bell 47G-3B1) & Westland (Westland-Agusta-Bell 47G-3B1). Also, used by Luftwaffe (West Germany); Italian Navy; Spanish Navy.
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