Posted on May 14, 2023
3rd Radio Research Unit Arrives in Vietnam, May 13, 1961
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Americans had been sending supplies to South Vietnam and had assumed responsibility for training its army when France pulled out of the country in 1954. John F. Kennedy, who took office in 1961 and was committed to beating Communism, took immediate steps to assist the South Vietnamese in winning the political, military, economic, and psychological war against Communist-backed insurgency.
It wasn’t long, however, before the Republic of Vietnam needed more specific assistance. For example, the South Vietnamese army was trying to monitor the communications of the North Vietnamese-backed guerilla forces but needed help. The US Army supplied radio receivers and AN/PRD-1 direction-finders to support this effort. Shortly thereafter, US Army intelligence personnel began planning for a deployment to Southwest Asia to conduct small-scale communications intelligence (COMINT) operations.
It wasn’t long, however, before the Republic of Vietnam needed more specific assistance. For example, the South Vietnamese army was trying to monitor the communications of the North Vietnamese-backed guerilla forces but needed help. The US Army supplied radio receivers and AN/PRD-1 direction-finders to support this effort. Shortly thereafter, US Army intelligence personnel began planning for a deployment to Southwest Asia to conduct small-scale communications intelligence (COMINT) operations.
3rd Radio Research Unit Arrives in Vietnam, May 13, 1961
Posted from stationhypo.comPosted in these groups: 
Cryptology
Vietnam War
Cryptology Vietnam War
Posted 12 mo ago
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PO1 William "Chip" Nagel
..."By mid-1965, ASA had a total of 1,487 personnel distributed among three units: the 3rd RRU, the 7th RRU, and the 8th RRU. The 3rd RRU served as the command element over all three. However, over the next nine months, the creation of direct support units forced the 3rd RRU Commander into the untenable position of having to divide his attention between his own operational mission and ensuring that the direct support units were meeting the needs of their field commands. Therefore, ASA discontinued the 3rd RRU on June 1, 1966 and redistributed its mission and resources among four new organizations under the administrative control of the 509th Radio Research Group. Within six years of the 3rd RRU’s initial arrival, ASA’s in-country strength would be nearly 6,000 personnel, divided into 20 to 30 units that were further broken down into detachments and teams located at remote sites and fire support bases. At any given time more than 100 such elements could be scattered throughout South Vietnam — all commanded by the 509th Radio Research Group.
Following the cease-fire in October 1972, the 509th RR Group was discontinued on March 7, 1973 and the handful of its remaining soldiers boarded the last plane for home, bringing ASA’s 12-year tour of service in Vietnam to a close."...
..."By mid-1965, ASA had a total of 1,487 personnel distributed among three units: the 3rd RRU, the 7th RRU, and the 8th RRU. The 3rd RRU served as the command element over all three. However, over the next nine months, the creation of direct support units forced the 3rd RRU Commander into the untenable position of having to divide his attention between his own operational mission and ensuring that the direct support units were meeting the needs of their field commands. Therefore, ASA discontinued the 3rd RRU on June 1, 1966 and redistributed its mission and resources among four new organizations under the administrative control of the 509th Radio Research Group. Within six years of the 3rd RRU’s initial arrival, ASA’s in-country strength would be nearly 6,000 personnel, divided into 20 to 30 units that were further broken down into detachments and teams located at remote sites and fire support bases. At any given time more than 100 such elements could be scattered throughout South Vietnam — all commanded by the 509th Radio Research Group.
Following the cease-fire in October 1972, the 509th RR Group was discontinued on March 7, 1973 and the handful of its remaining soldiers boarded the last plane for home, bringing ASA’s 12-year tour of service in Vietnam to a close."...
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