The Federal Civil Defense Authority was established in the United States Department of Defense (DOD), by DOD Directive 5105.43, May 5, 1972.^[1]

• Federal Civil Defense Administration (FCDA), Office for Emergency Management (OEM), Executive Office of the President (EOP, 1950–1951)
• FCDA (1951–1958)
• Office of Defense and Civilian Mobilization (ODCM), EOP (1958)
• Office of Civil and Defense Mobilization (OCDM), EOP (1958–1961)
• Office of Civil Defense (OCD), DOD (1961–1964)
• OCD, United States Department of the Army, DOD (1964–1972)

It coordinated and directed federal, state, and local civil defense program activities, including fallout shelters; chemical, biological, and radiological warfare defense; emergency communications and warning systems; post-attack assistance and damage assessment; preparedness planning; and government continuity.

By EO 12148, July 20, 1979, retroactive to July 15, 1979, pursuant to Reorganization Plan No. 3 of 1978, effective April 1, 1979.

• Federal Emergency Management Agency (FEMA).

• Federal Civil Defense Administration

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