Looking further I discovered another Pentagon microwave route to Ft Monroe posted 10 years ago.
snippet from post #5091:
"RCA equipment was similar to the first military (Army Signal Corps)
microwave system developed during or just after WW-II. It was designated something like AN/TRC-6. This system was used for a link between the Pentagon and Fort Monroe, VA, which was placed in service on an experimental basis around 1946-47, and continued in operation for years. In its early days, at least, the repeater stations were manned."
Albert is quoted on this website posting:
I am familiar with the Amburg(repeater) area & I asked an old timer from there, here is the reply:
"It was there during the war with 2 soldiers stationed there doing whatever they do. It was on North End Road on Tom Crittenden's property about a mile from us as the crow flies. The remains of the building are still in the field but the tower is gone."
Amburg in that day was very rural & isolated;I'm sure the farmers & watermen were quite surprised & confused about this installation.
More on the AN/TCR-6:
--- In firstname.lastname@example.org, "OZOB99" <ozob99@...> wrote:
> I ran across this mention of a microwave link between Andrews AFB & the Pentagon in a 1971 GAO report:
> "According to a DCA official, there are 12 spare
> channels in a Government owned microwave system between
> the Pentagon and Andrews Air Force Base, Maryland"
> Other alledged Pentagon links in previous posts include Ft Bragg, Site E, & Mt Weather; I'd guess there were others over the years.
> Anyone know of other links, documented or suspected?
> It would be neat to have a chronological list someday with the RF & Mux gear used.