Cryptologic History Calendar
1961: Third Radio Research Unit began Army Security Agency service in South Vietnam.
This mission was in its early stages when one of their direction finding (DF) operators, SP4 James T. Davis, was killed in a Viet Cong ambush on a road outside Saigon. The date of the ambush, 22 December 1961, made Davis the first American soldier to lose his life during the Vietnam War. Click the link below to learn about SP4 Davis in a special NSA pdf.
SP4 Davis' name is engraved on the NSA/CSS Cryptologic Memorial Wall. The wall, dedicated in 1996, lists the names of 176 Army, Navy, Air Force, Marine, and civilian cryptologists who have made the ultimate sacrifice, "serving in silence," in the performance of their duties since World War II. Learn more via the links below.