A 92-man unit of the Army Security Agency, operating under cover of the 3rd Radio Research Unit (3rd RRU), arrived at Tan Son Nhut Air Base and established a communications intelligence facility in disused Republic of Vietnam Air Force (RVNAF) warehouses on the base (10°48′36″N 106°38′56″E﻿ / ﻿10.81°N 106.649°E﻿ / 10.81; 106.649).[24] This was the first full deployment of a U.S. Army unit to South Vietnam.[25][26]: 41–2