Arthur, have you tried posting this question on the "coldwarcomms" forum? They are focused primarily on the (now largely abandoned) microwave and L-carrier systems in the Continental US, but your query definitely relates to communications and the Cold War.
Their "charter" is as follows:
"A list dedicated to the discussion of various communications systems used by the U.S. military and civilian authorities during the Cold War era"
So, based on that, it seems that your query would certainly be "legit." The worst they could do is simply not answer it...
They are at
https://groups.yahoo.com/group/coldwarcomms/ Wish I had something more for you. Good luck in your research, and let us know what you find out!
Jim
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Speaking from a secure undisclosed location.
