June 8, 1956 - The first official death in Vietnam was United States Air Force Technical Sergeant Richard Bernard Fitzgibbon, Jr. of Stoneham, Massachusetts who was murdered by another U.S.A.F.
May 15, 1975 - 18 U.S. servicemen (14 Marines, two Navy corpsmen, and two Air Force crewmen) are killed on the last day of a rescue operation known as the Mayagüez incident with troops from the Khmer Rouge in Cambodia.