The Debt and Claims Management Center collects or settles delinquent debts for the Department of Defense by former military members and civilian employees.

The Defense Advanced Research Projects Agency (DARPA) serves as the central research and development organization of the Department of Defense.

The Defense Commissary Agency provides a worldwide network of commissaries that sell groceries and household supplies at low cost to members of the Armed Services.

The Defense Contract Audit Agency (DCAA) audits U.S. Department of Defense contracts.

The Defense Contract Management Agency (DCAMA) is responsible for contract management for the Department of Defense, the National Aeronautics and Space Administration, and several other federal, state, foreign and international governments and agencies. Its goal is to ensure contracts are fulfilled on time and at the correct cost.

The Defense Counterintelligence and Security Agency (DCSA) provides industrial security engagement and counterintelligence support to secure the trustworthiness of the U.S. government's workforce, contract support, technologies, services, and supply chains.

The Department of Defense (DOD) provides the military forces needed to deter war, and to protect the security of the United States.

The Defense Finance and Accounting Service (DFAS) oversees payments to Department of Defense servicemembers, employees, vendors and contractors. The Defense Finance and Accounting Services also provides Department of Defense decision makers with business intelligence, finance and accounting information.

The Debt and Claims Management Center collects or settles delinquent debts for the Department of Defense by former military members and civilian employees.

The Defense Health Agency (DHA) supports uniformed services health care, including the TRICARE health plan.

The Defense Information Systems Agency (DISA) provides a global infrastructure for information sharing and communication across the Department of Defense, from the President on down.

The Defense Intelligence Agency (DIA) provides defense intelligence to war fighters, planners, and policy makers.

The Defense Logistics Agency (DLA) provides logistical, acquisition, and technical support for the Army, Navy, Air Force, Marine Corps and other federal agencies and allies.

The Defense Nuclear Facilities Safety Board (DNFSB) reviews the content and implementation of health and safety standards at Department of Energy Defense Nuclear Facilities. The board also makes recommendations to the President and Secretary of Energy regarding health and safety issues at Defense Nuclear Facilities.

The Department of Defense POW/MIA Accounting Agency (DPAA) works to recover service members who became missing during their service.

The Defense Security Cooperation Agency (DSCA) supports U.S. national security and foreign policy interests. They train, educate, advise, and equip foreign security forces to respond to shared challenges.

The Defense Technical Information Center (DTIC) serves the Department of Defense as a repository of government funded scientific, technical, engineering and business related information.

The Defense Threat Reduction Agency (DTRA) is a combat support agency whose goal is to reduce the threat posed by weapons of mass destruction.

In 1961, the federal government and the governments of Delaware, New Jersey, Pennsylvania, and New York, entered into an agreement that created the Delaware River Basin Commission (DRBC). The Commission has the independent legal authority to oversee and manage the Delaware River Basin.

The Delta Regional Authority (DRA) is a partnership to improve economic and community growth in eight states. Those states are Alabama, Arkansas, Illinois, Kentucky, Louisiana, Mississippi, Missouri, and Tennessee.

The Denali Commission provides critical utilities, infrastructure, and economic support throughout Alaska.

The Department of Agriculture (USDA) provides leadership on food, agriculture, natural resources, and related issues.

The Department of Commerce (DOC) works with businesses, universities, communities, and the Nation’s workers to promote job creation, economic growth, sustainable development, and improved standards of living for Americans.

The Department of Defense (DOD) provides the military forces needed to deter war, and to protect the security of the United States.

The Department of Education (ED) fosters educational excellence, and to ensures equal access to educational opportunity for all.

The Department of Energy (DOE) manages the United States' nuclear infrastructure and administers the country's energy policy. The Department of Energy also funds scientific research in the field.

The Department of Energy’s (DOE’s) Office of Science supports scientific research in 10 of the Department of Energy's National Laboratories. The Science Office also operates several open-access scientific facilities that are available for projects of sufficient scientific merit.

The Department of Health and Human Services (HHS) protects the health of all Americans and provides essential human services.

The Department of Homeland Security (DHS) works to improve the security of the United States. The Department's work includes customs, border, and immigration enforcement, emergency response to natural and manmade disasters, antiterrorism work, and cybersecurity.

The Department of Housing and Urban Development (HUD) administers programs that provide housing and community development assistance. The Department also works to ensure fair and equal housing opportunity for all.

The Department of Justice (DOJ) enforces federal laws, seeks just punishment for the guilty, and ensures the fair and impartial administration of justice.

The Department of Labor (DOL) administers federal labor laws to guarantee workers' rights to fair, safe, and healthy working conditions, including minimum hourly wage and overtime pay, protection against employment discrimination, and unemployment insurance.

The Department of State (DOS) advises the President and leads the nation in foreign policy issues. The State Department negotiates treaties and agreements with foreign entities and represents the United States at the United Nations.

The Department of the Interior (DOI) manages public lands and minerals, national parks, and wildlife refuges and upholds Federal trust responsibilities to Indian tribes and Native Alaskans. Additionally, Interior is responsible for endangered species conservation and other environmental conservation efforts.

The Department of the Treasury manages federal finances by collecting taxes and paying bills and by managing currency, government accounts and public debt. The Department of the Treasury also enforces finance and tax laws.

The Department of Transportation (DOT) is responsible for planning and coordinating federal transportation projects. It also sets safety regulations for all major modes of transportation.

The Department of Veterans Affairs (VA) runs programs benefiting veterans and members of their families. It offers education opportunities and rehabilitation services and provides compensation payments for disabilities or death related to military service, home loan guaranties, pensions, burials, and health care that includes the services of nursing homes, clinics, and medical centers.

The Office of the Director of National Intelligence (ODNI) integrates the intelligence gathering and analysis functions performed across the intelligence community to provide intelligence to decision makers.

The Office of Disability Employment Policy (ODEP) creates policies to ensure that people with disabilities are fully integrated in the workforce.

The Drug Enforcement Administration (DEA) enforces the United States' controlled substance laws and regulations and aims to reduce the supply of and demand for such substances.