Machrihanish's secret hangar played host to quite a few things in it's time. Once inside, the crew didnt need to re-appear as it was linked underground to the US facility.
The first deployments were as far back as 83. What was unusual was having to work nights when we didnt have enough staff to man ATC and the support facilities, but no concept of why we were havng to do it.
Even more amazing were the steps taken to stop the resident VAS in the hangar from seeing the new arrivals. At night, the duty team were forbidden to look outside of the crew room, whilst the ground handlers wore slip on blindfolds while they marshalled the A/C in. The day staff too wore blindfolds when outside of the offices, which also had the interior windows blacked out. The only person who didnt, was a civilian girl K--- S------- who worked there. Looking back I'm almost certain she was a CIA operative.
In hindsight, I'm suprised non of the 140 misfits who had the joy to be posted there didnt just lift the blindfolds up for a quick peek and blow the whole thing - But thats us guys - professional to the end. We made it look just like another posting in the middle of nowhere with no aircraft and nothing going on.