- ベトナム戦 実物 パッチ
米陸軍US Army Security Agency所属
第156航空中隊(156th USASA AVN CO軍事通信監視,盗聴)
- US Army Security Agency (ASA) 156th AVIATION COMPANY Vietnam War
During Vietnam war, the 156th Aviation Company (Radio Research) was at Can tho in support of IV Corps tactical group
whose assigned command was the 509th US Army Security Agency Group.
The US Army Security Agency (ASA) was the United States Army's signal intelligence branch. Its motto was "Vigilant Always."
The Agency existed between 1945 and 1976 and was the successor to Army signal intelligence operations dating back to World War I.
Composed of soldiers with high scores on Army intelligence tests, the ASA was tasked with monitoring
and interpreting military communications of the Soviet Union, the People’s Republic of China,
and their allies and client states around the world. Although not officially serving under the ASA name, covertly designated as Radio Research,
ASA personnel of the 509th Radio Research Battalion were among the earliest U.S. military advisors in Vietnam.
The first battlefield fatality of the Vietnam War was Specialist 4 James T. Davis (from Livingston, Tennessee) who was killed on 22 December 1961,
on a road near the old French Garrison of Cau Xang. He had been assigned to the 3rd Radio Research Unit at Tan Son Nhut Air Base near Saigon,
along with 92 other members of his unit. Davis Station in Saigon was named after him.
President Lyndon Johnson later termed Davis "the first American to fall in the defense of our freedom in Vietnam".
Most ASA personnel processed in country through Davis Station; others attached to larger command structures prior to transport to Vietnam processed in with those units.
For example, the 601st Radio Research Unit, attached to the 198th Light Infantry Brigade, processed in with that brigade.
ASA personnel were attached to Army infantry and armored cavalry units throughout
the Vietnam War. Some select teams were also attached to MACV/SOG and Special Forces units.
Some teams were independent of other army units, such as the 313th Radio Research Brigade at Nha Trang.
Many ASA personnel remained in Vietnam after the 1973 pullout of US Army combat forces and remained present until the Fall of Saigon in April of 1975.
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