Sikorsky H-34
- Algerian War; Vietnam War
- United States (British licensed and developed into Westland Wessex)
- UH-34D (HUS-1 Seahorse) - Utility transport version of HSS-1 for U.S. Marine Corps in 1962.
- SH-34G (HSS-1 Seabat) - Anti-Submarine model for the U.S. Navy. 215 built.
- SH-34J (HSS-1N) - Anti-Submarine model + night/bad weather version for U.S. Navy. 167 built.
- UH-34J - SH-34J without Anti-Submarine Warfare (ASW) equipment for cargo and training purposes.
- Wessex HAS.1 - Royal Navy utility, anti-submarine warfare, air-sea rescue. 140 built, some are converted to HAS.3 later.
- Wessex HAS.3 - Royal Navy anti-submarine version with improved avionics with a radome on the rear fuselage, (3 built & 43 converted from HAS.1)
- Wessex HU.5 - Royal Navy troop transporter, carried 16 Royal Marines, 101 built.
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