Most of the engraved lighters in Vietnam have identification code from 1965 to 1973 (the American troops withdrew from Vietnam at the beginning of 1973. Only supervisors stayed in Vietnam until the fall of Saigon April 30, 1975). All the lighters made between 1932 and 1975 could be engraved in Vietnam. At that time a lot of war correspondents, tourists, keen fighters, and special force members have sojourned in Vietnam and few of them used Zippo lighters. Soldiers from Korea or World War II carried their old friend in Vietnam.