Final answer:
The communist insurgents in South Vietnam were known as the Vietcong, VC, and Charlie, instrumental in the Vietnam War.
Explanation:
The communist insurgents in South Vietnam called themselves the Vietcong. They were also known as 'VC' and were eventually referred to as 'Charlie.' These fighters operated in South Vietnam, supported by the North Vietnamese, and played a significant role in the Vietnam War.
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