Whilst I’m sure there are opsec protocols that can do something to protect you from modern (military style) drones, it’s very very very hard to stop an adversary with a nearly unlimited amount of money and incredible technological superiority from keeping their eyes on you once you’re in their sights.
Yet, the US has pretty much been kept at bay from Irak and Afghanistan, go figure... In general, the US army is not equipped for guerilla-style warfare, and especially not on US soil. Local PD are another story on this point, but far less equipped.
See also training facilities in for instance Fort Polk, or the german Schnöggersburg, where that is only the largest, but not the only one.
Also things like https://www.nationaldefensemagazine.org/articles/2019/7/29/d... come to mind.