Viet Cong (n.)youdaoicibaDictYouDict[Viet Cong 词源字典]
"the communist guerilla force in Vietnam 1954-1976," also Vietcong, 1957, from Vietnamese, in full Viêt Nam Cong San, literally "Vietnamese communist."[Viet Cong etymology, Viet Cong origin, 英语词源]