Photos Courtesy of Bill Davidson (Click for larger, uncropped versions)
Special Activities Detachment - III sat on the hill overlooking the operations compound at the Army Security Agency Field Station at Camp Humphreys, ROK. SAD-III was officially known as Project Leftout, but no one who knows why is talking.

U.S. Army Security Agency
Special Activities Detachment-III
1969-1975

SAD-III was the last of the ASA special activities units created in the 1960s. SADs-I and - II were airborne: SAD-III was ground-based.

SAD-III was a mobile unit on three semi-trailers that could be bolted together in parallel to form a functioning station. Two of the trailers had three cargo containers placed end-to-end housing the communications center and equipment maintenance areas. The third trailer had two containers up front with electronic eqiupment, and a multi-frequency antenna at the rear.


An overhead view
looking north, with antenna field and operations buildings
in the background. Taken
from the water tower.

A full description SAD-III's mission must await word from the U.S.Army on information declassification status. A letter requesting access to all declassified information was sent October 2003.

Sad-III came into being in 1968 at Vint Hills Farm. It was intially deployed to Japan for testing late that year via ship, then returned by plane to Vint Hills in late 1969 for a complete redesign and refit. In December 1970, the trailers were loaded one each into Air Force jet transports at Andrews Air Force Base in Washington and flown to Korea.

The unit remained in Korea until 1975, when it was returned to Vint Hills for another refit. I'll let Bill Davidson, a former ASA soldier and SAD-III's last civilian rep, tell you about the end:

"In January 1974 I was assigned to Project Leftout (SAD III) for 18 months. Sadly in June 1975 NSA pulled the plug on the operation. ASA left two enlisted guys to help myself and another Radiation guy named Bill Lappin pack the system for shipment back to Vint Hill Farms. The worst part of trying to get the system ready for shipment was to rebuild the wheels and breaks along with the leveling jacks which hadn't be used since the system was installed. The system was shipped from Puson as deck cargo in early July 1975.

"The next time I saw the system was at VHF in mid August 1975 where it was being stripped down for refurbishment. After refurbishment the system was supposed to go to Germany to pick up for operations that were shut down in Turkey but in November the refurbishment was stopped "do to lack of funds." About a year later I heard that the antenna system was removed from its trailer and sent to Norway for use by the boys from Langley. That's the last I ever heard about the SAD III system."



Photo by John Mikes
Taken from off post, just west of An Jong-ri, summer 1971. The side door is open, as it often was, because the crappy, undersized and overworked air conditioners were usually broken down, despite the valiant efforts of our AC tech Randy Harrison.

The antenna array, with compound guard tower in the background.


Rear of the trailers, with the antenna pointing north. Main entry was by the canvas tunnel at the right.



These pages owned and operated by John Mikes, ex-E5, ex-33C20. United States Army Security Agency, 1969-72.
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