Cobra to be exchanged quickly through the course of the mission. Much of the Cobra's armaments could be installed upon the multiple hardpoints that were attached to the stub wings set on either side of the fuselage. In comparison to armed UH-1s, the Cobra would typically carried twice as much ammunition and arrive on station in half the time, it also had three times the loiter time, which enabled the type to arrive in a designated landing zone ahead of transport helicopters to clear it, provide support fire while they are present, and to continue fighting as they withdraw. The slim profile of the helicopter allegedly provided defensive benefits by making it harder for opponents to accurately hit it with small arms fire, although man-portable air-defense system (MANPADS) did prove to be effective against the Cobra. Particularly vulnerable areas included the tail rotor drive shaft and to the main transmission. Typically, the Cobra would avoid hovering at any point in an active engagement; instead, emphasis was placed on maintaining speed and mobility. The gunner often fired the chin-mounted cannon with the intention of suppressing hostile targets in between barrages of 2.75-inch rockets, held in pods upon the stub wings, which were fired by the back-seater. It was unusual for Cobras to operate alone; instead, two or more would be dispatched and teamwork encouraged, leading to hunter-killer tactics being used to flush out and eliminate ground targets. Pairings with other helicopters, such as the Bell OH-58 Kiowa scout helicopter, were also common occurrences. Radio communications were handled by the gunner. Regardless of mission profile, low altitude flying was commonplace. Operational history United States By June 1967, the first AH-1G HueyCobras had been delivered. Originally designated as UH-1H, the "A" for attack designation was soon adopted and when the improved UH-1D became the UH-1H, the HueyCobra became the AH-1G. The AH-1 was initially considered a variant of the H-1 line, resulting in the G series letter. The first six AH-1s arrived at Bien Hoa Air Base, South Vietnam on 30 August 1967 for combat testing by the U.S. Army Cobra New Equipment Training Team. On 4 September, the type scored its first combat kill by sinking a sampan boat, killing four Viet Cong. The first AH-1 unit, the 334th Assault Helicopter Company, was declared operational on 6 October 1967. The Army operated the Cobra continuously up to the U.S. withdrawal from South