3 upgrades: a head-up display, a laser rangefinder, an infrared jammer mounted above the engine exhaust, and an infrared suppressing engine exhaust system, and the M143 Air Data Subsystem (ADS). The AH-1F is also referred to as the "Modernized AH-1S", "AH-1S Modernized Cobra", or "AH-1S(MC)" prior to 1988. Model 249 Experimental demonstrator version fitted with the four-blade rotor system from Bell 412, an uprated engine, and experimental equipment, including Hellfire missiles. Bell 309 KingCobra Experimental all-weather version based on the AH-1G single-engine and AH-1J twin-engine designs. Two Bell 309s were produced; the first was powered by a PW&C T400-CP-400 Twin-Pac engine set and the second was powered by a Lycoming T-55-L-7C engine. Twin-engine Operators A small number of former military helicopters are operated by civil organizations for display and demonstration, for example by Red Bull. Bahrain Air Force Japan Ground Self-Defense Force Royal Jordanian Air Force No. 10 Squadron RJAF (AH-1S) No. 12 Squadron RJAF (AH-1S) Kenya Air Force Pakistan Air Force Pakistan Army Philippine Air Force Republic of Korea Army Royal Thai Army Turkish Army Florida Department of Forestry U.S. Forest Service Former operators Israeli Air Force Spanish Navy U.S. Army Washington State Department of Natural Resources Aircraft on display Specifications (AH-1G HueyCobra) Notable appearances in media See also References Citations Bibliography External links AH-1 Cobra page on GlobalSecurity.org AH-1 HueyCobra page on Rotorhead.org AH-1 Cobra Photo Galleries on MidwaySailor.com Cobras over the Frontier, by Usman Ansari. End of an era for Fort Drum's Cobras. Aircraft Training Manual, Attack Helicopter, AH-1 (TC 1-213), 1992 H-001, A Bell AH-1 Cobra Bell AH-1 Cobra Bell AH-1 Cobra Gunships Single-turbine helicopters Aircraft first flown in 1965 Attack helicopters Military equipment of the Vietnam War