Etymology
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Vietnam 
country in Southeast Asia, from Vietnamese Viet, the people's name + nam "south." Division into North and South lasted from 1954 to 1976. Vietnam War attested by 1963.
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Nam (n.)
colloquial shortening of Vietnam, 1969, originally among U.S. troops sent there.
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Vietnamese 
1947 (adjective and noun), from Vietnam + -ese.
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ARVN (n.)
acronym for Army of the Republic of Vietnam, ground military force of South Vietnam, organized 1955.
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no-win (adj.)

1962, in reference to a situation where victory is impossible, from no + win. Apparently popularized in connection with the Vietnam War.

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attrit (v.)
1956, U.S. Air Force back-formation from attrition in the military sense. It attained currency during the Vietnam War. Related: Attritted; attritting.
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Saigon 
southern Vietnamese city, capital of former South Vietnam, named for its river, which bears a name of uncertain origin.
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bong (n.2)
"water pipe for marijuana," 1960s, U.S. slang, said to have been introduced by Vietnam War veterans, said to be from Thai baung, literally "cylindrical wooden tube."
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Tet (n.)
Vietnamese lunar new year, 1885, short for Tet Nguyen Dan "feast of the first day." The North Vietnamese Tet Offensive in the U.S. Vietnam War began Jan. 30, 1968.
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