The workhorse of the Vietnam War was said to be the Huey helicopter.
This is due to the fact that the Huey, also known as the Bell UH-1 Iroquois, served in a number of capacities during that fight. It performed medical airlifts, carried troops into combat, and even performed attack helicopter duties. Around 17,000 Hueys have been constructed for service over the years since they were first put into use in the late 1950s. Throughout the final decades of the 20th century, the US utilized them in innumerable combat missions. In 1963, the first Huey gunships from a manufacturer were deployed in Vietnam. Hueys were retrofitted with.30-caliber machine guns and rocket pods to serve as armed escorts after their initial term as solely medevac birds, including for Navy River patrol boats in the
Source: https://www.coffeeordie.com/huey-helicopter-workhorse-vietnam-war
