While I was rambling about in NI I was driving along a lovely little country lane and came around a corner to find myself face to face with a Brit patrol on foot in full kit. They were, as is said, "heavily armed," but polite if hyper-wary. I had already been "covered" by the turret man of an armored car with his HMG and so was appropriately circumspect about the encounter. Hands in sight and all that.
A few miles down the road I came into a section that gave me a good view of one of the most notorious British "hillside fortresses" in NI. I don't know what the official army name for it was, but locally it was known simply as Mullaghmor.
I stopped my little car to look at it. They had removed all vegetation immediately below it and it gave the impression of a medieval castle with modern amenities such as a forest of aerials and what appeared to be radar dishes as well. Can't be sure about that.
Then, while I was glassing them with my little binocs I had the sudden icy realization that they were doing the same to me from those dark tinted windows so far above me. I snapped a quick picture (above) and drove on, gratefully unpursued by Flying Monkeys or armored Land Rovers.