I pissed off a portable Satcom operator in Honduras once. I had just exited a Chinook and walked up to a couple dudes sitting on the ground and struck up a conversation.
I reached down and picked up a funny looking contraption on the ground to look at. Dude started yelling, found out it was an antenna that was aimed at a satellite. Never seen one before, but know what they are now.
Later on, the dudes let us call home on it. They contacted Wright Patterson AFB who patched us into the landline.
Pretty cool stuff, except for the echo.
This was the early 80's and I was only familiar with regular HF/VHF stuff.