Y-12 National Security Complex.
official-recordmilitary_installationUS Department of Energy (DOE)
The NNSA uranium-component production and secure special-nuclear-material storage/assembly complex at Oak Ridge, TN (est. 1943 for uranium enrichment).
Part of the documented born-secret DOE/NNSA site map that concentrates Restricted Data. Folded to complete the facility apparatus; documented function, not a UAP claim.