The United States Armed Forces are the military forces

Armed forces

The armed forces of a country are its government-sponsored defense, fighting forces, and organizations. They exist to further the foreign and domestic policies of their governing body, and to defend that body and the nation it represents from external aggressors. In some countries paramilitary...

 of the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. They consist of the Army

United States Army

The United States Army is the main branch of the United States Armed Forces responsible for land-based military operations. It is the largest and oldest established branch of the U.S. military, and is one of seven U.S. uniformed services...

, Navy

United States Navy

The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

, Marine Corps

United States Marine Corps

The United States Marine Corps is a branch of the United States Armed Forces responsible for providing power projection from the sea, using the mobility of the United States Navy to deliver combined-arms task forces rapidly. It is one of seven uniformed services of the United States...

, Air Force

United States Air Force

The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

, and Coast Guard

United States Coast Guard

The United States Coast Guard is a branch of the United States Armed Forces and one of the seven U.S. uniformed services. The Coast Guard is a maritime, military, multi-mission service unique among the military branches for having a maritime law enforcement mission and a federal regulatory agency...

.

The United States has a strong tradition of civilian control of the military

Civilian control of the military

Civilian control of the military is a doctrine in military and political science that places ultimate responsibility for a country's strategic decision-making in the hands of the civilian political leadership, rather than professional military officers. One author, paraphrasing Samuel P...

. The President

President of the United States

The President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....

 is the overall head of the military, and helps form military policy with the United States Department of Defense

United States Department of Defense

The United States Department of Defense is the U.S...

 (DoD), a federal executive department

United States Federal Executive Departments

The United States federal executive departments are among the oldest primary units of the executive branch of the federal government of the United States—the Departments of State, War, and the Treasury all being established within a few weeks of each other in 1789.Federal executive...

, acting as the principal organ by which military policy is carried out. The DoD is headed by the Secretary of Defense

United States Secretary of Defense

The Secretary of Defense is the head and chief executive officer of the Department of Defense of the United States of America. This position corresponds to what is generally known as a Defense Minister in other countries...

, who is a civilian and Cabinet

United States Cabinet

The Cabinet of the United States is composed of the most senior appointed officers of the executive branch of the federal government of the United States, which are generally the heads of the federal executive departments...

 member. The Secretary of Defense is second in the military's chain of command

Chain of Command

Chain of Command may refer to:* Chain of command, in a military context, the line of authority and responsibility along which orders are passed* "Chain of Command" , the fifth episode of the first season of Beast Wars...

, just below the President, and serves as the principal assistant to the President in all matters related to the Department of Defense.