USMC with different avionics and equipment. 192 built. NUH-1E: UH-1E configured for testing. TH-1E: UH-1C configured for Marine Corps training. Twenty were built in 1965. UH-1F: UH-1B/C for USAF with General Electric T58-GE-3 engine of . 120 built. TH-1F: Instrument and Rescue Trainer based on the UH-1F for the USAF. 26 built. UH-1H: Improved UH-1D with a Lycoming T53-L-13 engine of . 5435 built. CUH-1H: Canadian Forces designation for the UH-1H utility transport helicopter. Redesignated CH-118. A total of 10 built. EH-1H: Twenty-two aircraft converted by installation of AN/ARQ-33 radio intercept and jamming equipment for Project Quick Fix. HH-1H: Search and rescue (SAR) variant for the USAF with rescue hoist. A total of 30 built. JUH-1: Five UH-1Hs converted to SOTAS battlefield surveillance configuration with belly-mounted airborne radar. TH-1H: Recently modified UH-1Hs for use as basic helicopter flight trainers by the USAF. HH-1K: Purpose-built SAR variant of the Model 204 for the US Navy with USN avionics and equipment. 27 built. TH-1L: Helicopter flight trainer based on the HH-1K for the USN. A total of 45 were built. UH-1L: Utility variant of the TH-1L. Eight were built. UH-1M: Gunship specific UH-1C upgrade with Lycoming T53-L-13 engine of . UH-1N: Initial Bell 212 production model, the Bell "Twin Pac" twin-engined Huey powered by Pratt & Whitney Canada T400-CP-400. UH-1P: UH-1F variant for USAF for special operations use and attack operations used solely by the USAF 20th Special Operations Squadron, "the Green Hornets". EH-1U: No more than two UH-1H aircraft modified for Multiple Target Electronic Warfare System (MULTEWS). UH-1V: Aeromedical evacuation, rescue version for the US Army. EH-1X: Ten Electronic warfare UH-1Hs converted under "Quick Fix IIA". UH-1Y: Upgraded variant developed from existing upgraded late model UH-1Ns, with additional emphasis on commonality with the AH-1Z. Note: In U.S. service, the G, J, Q, R, S, T, W and Z model designations are used by the AH-1. The UH-1 and AH-1 are considered members of the same H-1 series. The military does not use I (India) or O (Oscar) for aircraft designations to avoid confusion with "one" and "zero" respectively. Other military variants Bell 204: Bell Helicopters company designation, covering aircraft from the XH-40, YH-40 prototypes to the UH-1A, UH-1B, UH-1C, UH-1E, UH-1F, HH-1K, UH-1L, UH-1P and UH-1M production aircraft. Agusta-Bell AB 204: Military utility transport helicopter. Built under license in Italy by Agusta. Agusta-Bell AB 204AS: Anti-submarine warfare, anti-shipping version of the