Anti-Imperialist Territorial Nuclei (NTA)

APIS (Advance Passenger Information System)

Archeology and Artifacts, Protection of During War

Architecture and Structural Security

Area 51 (Groom Lake, Nevada)

Argentina, Intelligence and Security

Argonne National Laboratory

Armed Islamic Group (GIA)

Arms Control, United States Bureau

Army for the Liberation of Rwanda (ALIR)

Army Security Agency

'Asbat Al-Ansar

Asilomar Conference

Assassination

Assassination Weapons, Mechanical

Asymmetric Warfare

ATF (United States Bureau of Alcohol, Tobacco, and Firearms)

Atmospheric Release Advisory Capability (ARAC)

Audio Amplifiers

Aum Supreme Truth (Aum)

Australia, Intelligence and Security

Austria, Intelligence and Security

Aviation Intelligence, History

Aviation Security Screeners, United States

B-2 Bomber

B-52

Bacterial Biology

Ballistic Fingerprints

Ballistic Missile Defense Organization, United States

Ballistic Missiles