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Legislative definitions of a federal agency are varied, and even contradictory. The official United States Government Manual offers no definition.   While the Administrative Procedure Act definition of "agency" applies to most executive branch agencies, Congress may define an agency however it chooses in enabling legislation, and through subsequent litigation often involving the Freedom of Information Act and the Government in the Sunshine Act. These further cloud attempts to enumerate a list of agencies.  
The executive branch of the federal government includes the Executive Office of the President and the United States federal executive departments (whose secretaries belong to the Cabinet). Employees of the majority of these agencies are considered civil servants.
The majority of the independent agencies of the United States government are also classified as executive agencies (they are independent in that they are not subordinated under a Cabinet position). There are a small number of independent agencies that are not considered part of the executive branch, such as the Congressional Research Service and the United States Sentencing Commission, which are legislative and judicial agencies, respectively.
The U.S. Congress is the bicameral legislature of the United States government, and is made up of two chambers: United States Senate (the upper chamber), and United States House of Representatives (The lower chamber). Together, the two chambers exercise authority over the following legislative agencies:
Congress also maintains special administrative agencies like:
The legislature is also in charge of the Library of Congress (LOC). A national library dedicated to national records and administers various programs, agencies, and services including:
Agencies within the judicial branch:
The President of the United States is the chief executive of the Federal Government. He is in charge of executing federal laws and approving, or vetoing, new legislation passed by Congress. The President resides in the Executive Residence (EXR) maintained by the Office of Administration (OA).
To effectively run the country's affairs, the President also maintains councils regarding various issues, including:
|National Security Council||Assistant to the President for National Security Affairs||Jake Sullivan|
|National Space Council||Executive Secretary of the National Space Council||Chirag Parikh |
|Homeland Security Council [lower-alpha 1]||Assistant to the President for Homeland Security and Counterterrorism [lower-alpha 2]||Elizabeth Sherwood-Randall|
|Council of Economic Advisers||Chairman of the White House Council of Economic Advisers||Cecilia Rouse|
|Council on Environmental Quality||Chairman of the Council on Environmental Quality||Brenda Mallory|
|President's Intelligence Advisory Board||Chairman of the President's Intelligence Advisory Board||TBD|
|Executive Residence Staff and Operations||White House Chief Usher||Robert B. Downing|
|Office of Administration||Director of the Office of Administration||Anne Filipic|
| Office of Management and Budget ||Director of the Office of Management and Budget||Shalanda Young|
|Office of National Drug Control Policy||Director of National Drug Control Policy||Rahul Gupta|
|Office of the National Cyber Director||National Cyber Director||Chris Inglis|
|Office of Science and Technology Policy||Director of the Office of Science and Technology Policy||Alondra Nelson|
|Office of the United States Trade Representative||United States Trade Representative||Katherine Tai|
|Office of the Vice President of the United States||Chief of Staff to the Vice President||Tina Flournoy|
|White House Office||Assistant to the President and Chief of Staff||Ron Klain|
The United States secretary of defense (SecDef) is the head of the United States Department of Defense, the executive department of the U.S. Armed Forces, and is a high ranking member of the federal cabinet. The secretary of defense's position of command and authority over the military is second only to that of the president of the United States, who is the commander-in-chief. This position corresponds to what is generally known as a defense minister in many other countries. The secretary of defense is appointed by the president with the advice and consent of the Senate, and is by custom a member of the Cabinet and by law a member of the National Security Council.
The United States Department of Health and Human Services (HHS) is a cabinet-level executive branch department of the U.S. federal government created to protect the health of the U.S. people and providing essential human services. Its motto is "Improving the health, safety, and well-being of America". Before the separate federal Department of Education was created in 1979, it was called the Department of Health, Education, and Welfare (HEW).
The United States Department of the Interior (DOI) is one of the executive departments of the U.S. federal government headquartered at the Main Interior Building, located at 1849 C Street NW in Washington, D.C. It is responsible for the management and conservation of most federal lands and natural resources, and the administration of programs relating to Native Americans, Alaska Natives, Native Hawaiians, territorial affairs, and insular areas of the United States, as well as programs related to historic preservation. About 75% of federal public land is managed by the department, with most of the remainder managed by the Department of Agriculture's Forest Service. The department was created on March 3, 1849.
The United States order of precedence is an advisory document maintained by the Ceremonials Division of the Office of the Chief of Protocol of the United States which lists the ceremonial order, or relative preeminence, for domestic and foreign government officials at diplomatic, ceremonial, and social events within the United States and abroad. The list is used to mitigate miscommunication and embarrassment in diplomacy, and offer a distinct and concrete spectrum of preeminence for ceremonies. Often the document is used to advise diplomatic and ceremonial event planners on seating charts and order of introduction. Former presidents, vice presidents, first ladies, second ladies, and secretaries of state and retired Supreme Court justices are also included in the list.
The secretary of the Air Force, sometimes referred to as the secretary of the Department of the Air Force, is the head of the Department of the Air Force and the service secretary for the United States Air Force and United States Space Force. The secretary of the Air Force is a civilian appointed by the president, by and with the advice and consent of the Senate. The secretary reports to the secretary of defense and/or the deputy secretary of defense, and is by statute responsible for and has the authority to conduct all the affairs of the Department of the Air Force.
A special agent or federal agent is an investigator or detective for a governmental or independent agency, who primarily serves in criminal investigatory positions. Additionally, many federal and state special agents operate in "criminal intelligence" based roles as well. Within the U.S. federal law enforcement system, dozens of federal agencies employ federal law enforcement officers, each with different criteria pertaining to the use of the titles Special Agent and Agent.
Identification badges of the Uniformed Services of the United States are insignia worn by service members conducting special duties, many of which can be awarded as permanent decorations if those duties are performed successfully. There are a few identification badges that are awarded to all services, others are specific to a uniform service. The Office of the President and Vice President and department/service headquarters badges are permanent decorations for those who successfully serve in those assignments. Some of the service level identification badges can be permanent decorations and others are only worn by a service member while performing specific duties, such as the Military Police Badge.
The Federal Law Enforcement Training Centers (FLETC) serves as an interagency law enforcement training body for 105 United States government federal law enforcement agencies. The stated mission of FLETC is to "...train those who protect our homeland". It also provides training to state, local, campus, tribal, and international law enforcement agencies. Through the Rural Policing Institute (RPI) and the Office of State and Local Training, it provides tuition-free and low-cost training to state, local, campus and tribal law enforcement agencies.
The United States Department of Defense is an executive branch department of the federal government of the United States charged with coordinating and supervising all agencies and functions of the U.S. government directly related to national security and the United States Armed Forces. The DoD is the largest employer in the world, with over 1.34 million active-duty service members as of June 2022. The DoD also maintains over 778,000 National Guard and reservists, and over 747,000 civilians bringing the total to over 2.87 million employees. Headquartered at the Pentagon in Arlington, Virginia, just outside Washington, D.C., the DoD's stated mission is to provide "the military forces needed to deter war and ensure our nation's security".
Executive Schedule is the system of salaries given to the highest-ranked appointed officials in the executive branch of the U.S. government. The president of the United States appoints individuals to these positions, most with the advice and consent of the United States Senate. They include members of the president's Cabinet, several top-ranking officials of each executive department, the directors of some of the more prominent departmental and independent agencies, and several members of the Executive Office of the President.
The federal government of the United States called is a "Feds" empowers a wide range of federal law enforcement agencies to maintain law and public order related to matters affecting the country as a whole.
Craig Richard McKinley is a retired United States Air Force general who served as the 26th Chief of the National Guard Bureau, serving from 2008 to 2012. He is the first officer from the National Guard to ever achieve the grade of a four-star general.
The United States Department of Defense (DoD) has a complex organizational structure. It includes the Army, Navy, the Marine Corps, Air Force, Space Force, the Unified combatant commands, U.S. elements of multinational commands, as well as non-combat agencies such as the Defense Intelligence Agency and the National Security Agency. The DoD's annual budget was roughly US$496.1 billion in 2015. This figure is the base amount and does not include the $64.3 billion spent on "War/Non-War Supplementals". Including those items brings the total to $560.6 billion for 2015.