409th Radio Research Detachment

The 409th Radio Research Detachment was a U.S. Army signals intelligence unit active during the Vietnam War. It operated under the auspices of the Army Security Agency (ASA), specializing in intercepting and analyzing enemy communications to provide critical intelligence for tactical operations. Deployed to Vietnam in the late 1960s, the 409th supported combat units by locating enemy forces and warning of impending attacks. The detachment played a vital role in electronic warfare and contributed significantly to the Army's intelligence-gathering capabilities throughout its deployment.