Defense Threat Reduction Agency
government agency
The Defense Threat Reduction Agency (DTRA) is both a defense agency and a combat support agency within the United States Department of Defense (DoD) for countering weapons of mass destruction (WMD; chemical, biological, radiological, nuclear, and high explosives) and supporting the nuclear enterprise. Its stated mission is to provide "cross-cutting solutions to enable the Department of Defense, the United States Government, and international partners to Deter strategic attack against the United States and its allies; Prevent, reduce, and counter WMD and emerging threats; and Prevail against WMD-armed adversaries in crisis and conflict." DTRA is headquartered in Fort Belvoir, Virginia. The DTRA mission, organization and management, responsibilities and functions, relationships, authorities, and administration are defined in DoD Directive 5105.62, Defense Threat Reduction Agency (DTRA).
Organizational history
DTRA was officially established on 1 October 1998, as a result of the 1997 Defense Reform Initiative by consolidating several DoD organizations, including the Defense Special Weapons Agency (successor to the Defense Nuclear Agency) and the On-Site Inspection Agency. The Defense Technology Security Administration and the Nunn–Lugar Cooperative Threat Reduction program office in the Office of the Secretary of Defense were also incorporated into the new agency.
In 2002, DTRA published a detailed history of its predecessor agencies, Defense's Nuclear Agency, 1947–1997, the first paragraph of which makes a brief statement about the agencies which led up to the formation of DTRA:
Defense's Nuclear Agency, 1947–1997, traces the development of the Armed Forces Special Weapons Project (AFSWP), and its descendant government organizations, from its original founding in 1947 to 1997. After the disestablishment of the Manhattan Engineering District (MED) in 1947, AFSWP was formed to provide military training in nuclear weapons' operations. Over the years, its sequential descendant organizations have been the Defense Atomic Support Agency (DASA) from 1959 to 1971, the Defense Nuclear Agency (DNA) from 1971 to 1996, and the Defense Special Weapons Agency (DSWA) from 1996 to 1998. In 1998, DSWA, the On-Site Inspection Agency, the Defense Technology Security Administration, and selected elements of the Office of Secretary of Defense were combined to form the Defense Threat Reduction Agency (DTRA).
DTRA employs approximately 1,400 DoD civilians and 800 uniformed service members at more than a dozen permanent locations worldwide.
Begin with the source’s own compact description: “Defense Threat Reduction Agency” is government agency. The dossier treats that line as a proposition to test through Defense, Threat and Reduction, not as a finished interpretation.
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The phrase “government agency” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The record creator and administrative purpose are central evidence, because official documentation reflects both action and institutional priorities. The source revision retrieved here is dated Sep 12, 2026. The linked authority identifier is Q749381. VIAF identifies the subject as 139737199. The Library of Congress control number is n98107591. 4 of 5 selected statements include explicit references; 2 carry qualifiers and 1 use preferred rank. The first chronological checks are 1998, 1997, 2002 and 1947.
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This entry incorporates text from “Defense Threat Reduction Agency” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.