D
DARPA - Defense Advanced Research Projects Agency (US Department of Defense (DoD) which manages and directs selected basic and applied research and development projects for the DoD)
DDTC - Directorate of Defense Trade Controls (agency within the Department of Commerce Bureau of Industry and Security (BIS) which oversees enforcement of export restrictions on defense-related articles, services, or technology)
DEA - Drug Enforcement Administration (agency responsible for the enforcement of federal drug laws)
DFAS - Defense Finance and Accounting Service
DHHS - Department of Health and Human Services - alternative name for Health and Human Services (HHS) Department (agency which oversees the nation's healthcare system and administers the Medicare and Medicaid programs)
DHS - U.S. Department of Homeland Security (agency created by the Homeland Security Act of 2002 to bring national security operations of various federal agencies under one umbrrella organization in an effort to coordinate U.S. security activities)
DIA - Defense Intelligence Agency (agency within the Department of Defense (DoD) responsible for the collection and analysis of intelligence data for the military branches)
DISA - Defense Information Systems Agency (agency arm of the Department of Defense (DoD) that provides support related to information technology and communications in military matters to the DoD, the White House, and the military branches)
DLA - Defense Logistics Agency (agency within the Department of Defense (DoD) which provides logistical support, budgetary advice, and technicl aid to the various military branches)
DOC - Department of Commerce (department which oversees commercial activities, promotes trade, and advocates on behalf of U.S. businesses)
DoD - U.S. Department of Defense (agency responsible for oversight of all military branches, military preparedness, defense budgets, and military readiness of the various services)
DOE - Department of Energy (agency responsible for maintenance of the nation's energy supplies, research and development of energy technologies, and development of nuclear power and protection of nuclear weapons)
DOI - Department of the Interior (agency responsible for management of public lands, mining and minerals development, and national parks)
DOJ - Department of Justice (agency responsible for enforcement of federal laws)
DOL - Department of Labor (agency responsible for labor relations, enforcement of laws dealing with union protections and oversight of union elections, and tracking and analysis of employment data)
DOL-OIG - Department of Labor Office of Inspector General (agency within the Department of Labor responsible for tracking DOL programs and activities)
DOS - Department of State (agency responsible for representing the United States in international relations and in dealings with foreign governments, staffing embassies, and for presenting the official position of the U.S. in dealings with the world)
DoT - Department of Transportation (agency responsible for dealing with transport issues relating to public transport - roads, highways, trains, airlines and for maintenance and operation of the various transport systems)
DSCA - Defense Security Cooperation Agency
DTIC - Defense Technical Information Center
DTRA - Defense Threat Reduction Agency