Bell AH-1F 'Cobra' attack helicopter. #100.
The Bell AH-1F 'Cobra' (143 production aircraft and 387 converted AH-1G Cobras) incorporates all Step 1 and 2 upgrades to the AH-1S. It also featured Step 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. -[Wikipedia]

Photo by Craig on Saturday, August 21, 1999 at the Fargo AirSho.