The Bell AH-1 Cobra was the world's first dedicated attack helicopter. Developed from the UH-1 Huey, the AH-1 first flew on September 7, 1965. The unmistakable narrow tandem-cockpit fuselage was designed specifically for the attack mission, with reduced frontal area and improved gun and rocket-pod aiming.
A full description for Cobra is on the way. In the meantime, you can fly this helicopter right now in the Absolute RC online flight simulator.
A helicopter scale subject for rotorcraft practice.