409TH RADIO RESEARCH DETACHMENT, ARMY SECURITY AGENCY
On 8 April 1966, the Army Security Agency activated the 409th Army Security Agency Detachment at Fort George G. Meade, Maryland.  The 80 man detachment was designed specifically to support the 11th Armored Cavalry Regiment in Vietnam. On 18 August 1966, the 409th ASA Detachment (known in Vietnam as the 409th Radio Research Detachment) was deployed with the Regiment to Vietnam. The 409th RRD payed a very important role in supporting the Regiment by providing communications intelligence, which targeted the elusive enemy.  This was accomplished by manual morse and voice intercepton, along with radio direction finding. Small teams from the 409th RRD deployed with elements of the Regiment in direct support of combat operations while others maintained collection sites at isolated fire support bases. The Detachment relayed its information directly to the local commander and provided him with reports from other Radio Research elements, which could include the results of airborne radio direction finding. In addition a team of specialists provided advice and assistance on communications security matters to the Regiment. Although small in size, the 409th RRD was quickly recognized for providing reliable information on a timely basis. For its efforts , the 409th RRD received a Valorous Unit Award, 4 Meritorious Unit Commendations, 4 Republic Of Vietnam Crosses Of Gallantry.
NAME	RANK	HOME OF RECORD	DATE OF LOSS	UNIT
Cochrane, John Floyd	1LT	Dearborn, MI	10/24/1955	409th Radio Research Detachment, 303rd Rr Bn, 509th Asa Grp, ASA
Colon, Harry Joseph	SP5	New York, NY	6/21/1969	409th Radio Research Detachment, 303rd Rr Bn, 509th Asa Grp, ASA

 

541ST MILITARY INTELLIGENCE DETACHMENT
The 541st Military Intelligence Detachment was activated in March 1966 at Fort Meade, Maryland.  The 541st deployed to Vietnam with the 11th Armored Cavalry Regiment in August 1966 and served the regiment until 1972.   During the deployment in Vietnam, the 541st Military Intelligence Detachment suffered two combat losses.
NAME	RANK	HOME OF RECORD	DATE OF LOSS	UNIT
Malone, Wallace James	SP4	Oxford, NE	11/21/1966	541st Military Intelligence Detachment
Whitehouse, Gregory Kent	CPT	Abilene, TX	3/6/1968	541st Military Intelligence Detachment

 

 

591st ENGINEER COMPANY (LE), 27th ENGINEER BATTALION, 34th ENGINEER GROUP, 20th ENGINEER BRIGADE
The 591st Engineer Company (Light Equipment) was attached to the 11th Armored Cavalry Regiment in 1967 to early 1968 under the 27th Engineer Battalion.  During that time the 591st Engineer Company lost five soldiers.  In early 1968, the 591st Engineer Company was transferred to Phu Bai/Hue to work with the 101st Airborne.  The five Rome Plows remained at Blackhorse Base Camp with operators when the company moved.
NAME	RANK	HOME OF RECORD	DATE OF LOSS	UNIT
Bellamy, Robert Lee	SSG*	Tampa, FL	3/22/1968	591st Engineer Company, 27th Engineer Battalion
Blissett, Jimmie Ray	SP4	Houston, TX	1/16/1968	591st Engineer Company, 27th Engineer Battalion
Eckstein, Rodget Dean	PFC	Kalispell, MT	10/2/1967	591st Engineer Company, 27th Engineer Battalion
Marshall, John Grady	SP4	Kansas City, MO	3/30/1968	591st Engineer Company, 27th Engineer Battalion
Mosher, Harvey Milford Jr	SP5	Austin, TX	11/4/1967	591st Engineer Company, 27th Engineer Battalion