- a soldier in the army of South Vietnam.
Origin of ARVN
1965–70; A(rmy of the) R(epublic of) V(iet) N(am)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
acronym for Army of the Republic of Vietnam, ground military force of South Vietnam, organized 1955.
Online Etymology Dictionary, © 2010 Douglas Harper