Yes, Dugway Proving Grounds, in Utah. I knew a retired female Master Sergeant who was stationed there as a counterintelligence agent.
Your well informed my friend. That area has quite “the history” from what we were told when we arrived in the summer of “65”. We, I and a bunch of other door gunners were there to get “familiarized with GE’s great gift to us,,,, “the mini-gun” Absolute awesome weapon.