Code of Federal Regulations Title 5. Administrative Personnel § 5.732.102 Definition and applicability

(1) Those positions that involve activities of the Government that are concerned with the protection of the nation from foreign aggression or espionage, including development of defense plans or policies, intelligence or counterintelligence activities, and related activities concerned with the preservation of the military strength of the United States;  and

(2) Positions that require regular use of, or access to, classified information. Procedures and guidance provided in OPM issuances apply.