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A decade or more ago I had a temp working for me who was a CS student at a nearby university. He was good at the routine stuff, but one question and his reason for it blew my mind. It had to do with how a change in our DNS server got to all the other DNS servers on the Internet in just a few hours. After some discussion on how this worked I realized that his primary misunderstanding was that he did not realize that the speed of light was a wee bit faster than the speed of sound.
There were other USAF personnel who were support and technical that did go "over the river" to places we called Lima Sites. Look up Lima Site 85 and see if anyone really believes in the concept of a Non-Combatant in the military. Oh, and as for being stationed stateside when the NVA moved south in April of 1972 there were quite a few GI's who thought they would be in the states for their full tour of duty that suddenly found themselves in our tropical paradise within just a couple of days.
You can passively block it, yes. There's nothing preventing you from building a Faraday cage around your home. You cannot ACTIVELY block it though (i.e. broadcast signals to intentionally interfere with it).
Get aluminum siding on your house and you WILL be in a Faraday cage! The voice of experience says so.