@67Dart273 will appreciate one of the radio systems they used.
It was called SLFCS (pronounced slif-cus). Survivable Low Frequency Communication System. At the launch sites it was receive only in the 14KHz - 60 KHz range!!!
Yup. I worked on all the comm including SLFCS. Most systems radio, intra-site and launch control. There were about 120 of us USAF wide. I worked at Minuteman bases 78-86. There is a Minuteman (National Park Site) site in South Dakota.
