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Ah, yes! The old Civil Defense frequencies were 560kc and 1620kc, usually marked on the AM bands of old radios with the little "triangle-in-circle" CD symbol.

In the 50's & early 60's..when the "Red-Flag Alert" was sent out, and the old EBS was activated, all radio stations were to sign off except those two frequencies, which were then signed on. Only those stations, which were fairly low-powered, were to operate until the All Clear had been sounded after an attack.

It was part of a program called CONELRAD, for CONtrol of ELectromagnetic RADiation. Back 'in the old days', bombers would lock onto radio stations in their target areas and guide themselves in that way. As electronic guidance systems got better, this system became obsolete, as bombers (and missles) no longer needed a target radio station.

Also, some (maybe all?) radio stations had to have hardened secure bomb shelters. (A friend was a DJ and told me about the station's shelter. It was apparently off-limits to almost everyone, as per gov't rules. This was a rural small town "non-clear-channel" AM station, FWIW.)

Then there are the munitions (secretly?) stored in County buildings. In the same rural county (same as the one with the AM station ref'd above), when I was doing a lot of consulting work for the County gov't, their computer "top dog" told me that she was responsible for "the guns" (didn't go into a lot of detail, other than to mention a bunch of rifles etc.) that "the government" had issued to the County as part of the old Civil Defense program. Apparently they were never "un-issued", and from what I gathered, no one had any idea of what they wre for! Seemed like they were just "there", and she was responsible for them (kept locked up in the basement), but there were no plans etc. for their deployment.

Kinda shocked me. I'd thought I had a fairly reasonable understanding of the old CD programs, but I'd never heard anything about munitions being squirreled away around the country by the feds.