TT, you have is exactly although I believe some Air assets are still there too.
You can close military bases, you can post servicemen, and you can offer civil servants relocation but you can't make them go.
A while back they were going to move Daws Hill to High Wycombe. Hardly the end of the earth but to some civil servants it was a step too far on their daily commute. When you are used to walking or cycling to work you don't want a 10 mile drive. They left in droves. The move didn't happen and they can back.
I don't know if they ever did close Daws Hill. If they had moved there would have been even less space at High Wycombe.