There was a collection in a hanger on the secured portion of the active base and you were bused over. Most of these planes were moved to a new section of the museum in 2016.
Funny SR-71 Story from Popular Mechanics
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That's curious. Why is that?
It's in a separate hanger from where all the other museum is located. You need to sign up for the trip over, and the hanger is secured. They do a background check on you before you are allowed to go. The bus leaves for the 2 minute drive on the hour. The bus comes back at 10 minutes before the hour to pick up the previous passengers. That's the best as I remember, it's been more than a decade since I've been there.
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I believe the Warner Robins base in Macon Ga has one as well. Even one of the small matching drones.
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All your questions on the museum can be answered here. It is quite a display.