In the early seventies we took a couple of Pumas up to Stromness Battery which used to defend the northwest entrance to Scapa Flow. (It didn't stop a Uboat from sneaking in and sinking a warship). The emplacements were still in place; one could go down to the magazines and the blast shutters still operated.
The accommodation was a time warp. The mess room was as it had been left in 1945. There were murals of a typical English scene with cottages complete with archways of roses over the door.
The Island of Hoy was where the Navy had their fuel store underground. I had a wander around the buildings and there was a lit tunnel leading into the hill. I was chased out by the team that was recovering all the heavy oil that the Navy had left behind.
There is a picture of a Puma on the Old Man of Hoy. The collective wasn't lowered fully in case the (5 tonne) weight caused it to collapse.
That would have been a Board of Inquiry and a half.