408th Radio Research Detachment (RRD)

The 408th Radio Research Detachment (RRD) was a U.S. Army signals intelligence unit activated during the Vietnam War. Tasked with intercepting and analyzing enemy communications, the 408th RRD played a vital role in providing actionable intelligence to American and allied forces. The unit operated advanced radio equipment and often deployed in support of combat operations, working closely with infantry and aviation units. Their efforts significantly contributed to counterinsurgency operations by disrupting Viet Cong and North Vietnamese Army communications. After the war, the detachment was inactivated as part of the wider restructuring of Army intelligence assets.