The Tucson airplane boneyard is refurbishing B52s.
https://www.google.com/search?q=Tucson+airplane+boneyard&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjft7GuhaTiAhUSRK0KHaNdCsIQ_AUIDygC&biw=1301&bih=620#imgdii=TEy41QhCfTyA5M:&imgrc=nvIwn8M8j3PjIM: