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• DAM – France's military intelligence agency.
• DANGLE – a spy who poses as a walk-in to penetrate the other side. Also see WALK-IN.
• DARPA – Defense Advanced Research Projects Agency (USA).
• DATA RECOVERY – bureaucrat-talk for the backdoor built into all US-exported crypto software since 1998.
• DCSS – Denmark's security service.
• DDIS – Denmark's intelligence agency.
• DEAD DROP – a physical location where communications, documents, or equipment is covertly placed for another person to collect without direct contact between the parties.
• DEAD-LETTER BOX – same as dead drop.
• DEAD-LETTER DROP – same as dead drop.
• DECOY – distracts adversary's attention.
• DEEP-COVER AGENT – permanent cover.
• DEFECTOR – a person who has renounced his/her country of citizenship.
• DGI – Cuba's intelligence agency.
• DGSE – France's intelligence agency.
• DHS - Department of Homeland Security - USA agency
• DIA – a US intelligence agency, the Defense Intelligence Agency.
• DIRTY TRICKS – covert sabotage carried out by a security service or intelligence agency, ranging from pranks to assassination.
• DIVERSION – distracts adversary's attention.
• DLB – acronym for dead-letter box. Also see DEAD DROP.
• DOPE BOOK – a notebook kept with a sniper rifle for the purposes of recording the atmospheric conditions, range, lighting, and resulting hit or miss of every shot fired.
• DOPPELGANGER – a look-a-like. See also LOOK-A-LIKE.
• DOUBLE-AGENT – simultaneously serves two adversaries (often with their knowledge).
• DRY CLEANING – active counter surveillance and anti-surveillance against pavement artists and wheel artists.
• DS – Bulgaria's security service, the Drzaven Sigurmost.
• DSD – Australia's signal intelligence agency, Defence Signals Directorate.
• DST – France's security service.
• DUBOK – Russian term for a dead-letter box. Also see DEAD DROP.