USASA Via Wikipedia
The United States Army Security Agency (ASA) was, from 1945 through 1976, the United States Army’s electronic intelligence branch. Its motto was “Vigilant Always.” The Agency was the successor to a number of Army signals intelligence operations dating back to World War I. As well as intelligence gathering, it also had responsibility for the security of Army communications and for electronic countermeasures operations. …
Composed primarily of soldiers with the very highest 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. ASA was directly subordinate to the National Security Agency and all field stations had NSA tech reps on site.
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ASA military occupational specialties (MOSs) included linguists, morse code intercept operators, non-morse (teletype and voice) intercept operators, communications security specialists, direction-finding equipment operators, cryptographers, communications traffic analysts, and electronic maintenance technicians and a 42 man Special Operations Detachment to conduct clandestine combat operations, among others. ASA had its own separate training facilities, MP corps, communication centers and chain of command.
These occupations, which required top secret clearance, were essential to U.S. Cold War efforts. ASA units operated in shifts, 24 hours a day, seven days a week. ASA troops were not allowed to discuss their operations with outsiders — in fact, they could not talk among themselves about their duties unless they were in a secure location. Even today, decades after they served, some of the missions still cannot be discussed. Owing to the sensitivity of the information with which they worked, ASA soldiers were subject to travel restrictions during and long after their time in service. The activities of the U.S. Army Security Agency have only recently been partially declassified.