US Department of Energy (DOE).

The US Department of Energy is the cabinet department created in 1977 by the DOE Organization Act (P.L. 95-91) that absorbed the federal energy and atomic-energy functions. It owns the US nuclear-weapons complex and the national laboratory system, and it is the agency statutorily empowered to classify 'Restricted Data' under the Atomic Energy Act. It matters to the UAP topic because the most security-sensitive US nuclear sites — where UAP/drone incursions have been reported — sit under DOE custody, and DOE's unique classification authority is invoked in arguments about why some records stay sealed.