Thats one of the big things AMARG does: spares reclaimation for use in active aircraft.
Thats why there are A-10s and B-1s there, for instance. Many of them are extraneous to operational requirements and are being picked clean/cannibalized to keep the operational fleet flying.
Others are kept in regenerable storage. Like the B-52 from this article. It means they aren’t picked clean (at least as much as other aircraft) so they can be put back into service if needed. As attrition replacements, for instance.
This BUFF was only there for seven years. Not to long ago they regenerated a NASA WB-57 (big wing high altitude version of the Canberra) that had been in mothballs since the 1970s. There are also old Grumman S-2 Trackers and C-1 Traders that are being pulled out after decades there for conversion to aerial tankers and carrier delivery planes for Brazil to operate off it’s ex-French carrier.
Back in the early 70’s I was doing IRAN’s on EB-57’s at Otis AFB in Massachusetts.
Only jet I ever saw with Buick jet engines on it. Not sure of the model number, but I think it was a J-65.