vietcong/ˌviː.ɛtˈkɒŋ/EtymologyUnadapted borrowing from Vietnamese Việt Cộng, short for Việt Nam cộng sản (“Vietnam(ese) communist(s)”).nameA communist organization and guerrilla army in South Vietnam and Cambodia that fought the South Vietnamese government, the United States, South Korea, and Australia during the Vietnam War and was supported by communist North Vietnam.nounA member of this organization.“Then I went to Cam Ranh Bay, a huge base, and received the same official briefing, upbeat and hopeful. Afterward, I asked the briefing officer if he thought any Vietcong were working on the base itself. He said yes. I asked how many, and he said, “We figure twenty to thirty percent of our employees are Vietcong.””