The first combat operation of the UH-1 was in the service of the U.S. Army during the Vietnam War. The original designation of HU-1
led to the helicopter's nickname of Huey. In September 1962, the designation was changed to UH-1, but "Huey" remained in common
use. Approximately 7,000 UH-1 aircraft saw service in Vietnam.   

The UH-1 has long been a symbol of US involvement in Southeast Asia in general and Vietnam in particular, and as a result of that
conflict, has become one of the world's most recognized helicopters. In Vietnam primary missions included general support, air assault,
cargo transport, medical evacuation (medevac), search and rescue, electronic warfare, and later, ground attack. During the conflict,
the craft was upgraded, notably to a larger version based on the Model 205. This version was initially designated the UH-1D and flew
operationally from 1963.

The Huey was used for various purposes. It was tasked with a ground attack or armed escort role and were outfitted with rocket
launchers, grenade launchers, and machine guns. As early as 1962, they were modified locally by the companies themselves, who
fabricated their own mounting systems. Huey,s tasked and configured for troop transport were often called "Slicks" due to an absence
of weapons pods. Slicks did have door gunners, but were generally employed in the troop transport and medevac roles