United States Armed Forces
The seals of the five service branches of the U.S. Armed Forces
Founded 14 June 1775 [N 1] Service branches United States Army United States Marine Corps United States Navy United States Air Force United States Coast Guard Headquarters , The Pentagon , U.S. Arlington County, Virginia Leadership Commander-in-Chief President Donald Trump Secretary of Defense James Mattis Secretary of Homeland Security Kirstjen Nielsen Chairman of the Joint Chiefs of Staff Gen , Joseph Dunford USMC Vice Chairman of the Joint Chiefs of Staff Gen , Paul J. Selva USAF Senior Enlisted Advisor to the Chairman CSM , John W. Troxell USA Manpower Military age 17 with parental consent, 18 for voluntary service. Maximum age for first-time enlistment is 35 for the Army, 28 for the Marine Corps, 34 for the Navy, 39 for the Air Force  and 27 for the Coast Guard.   Active personnel 1,281,900 (  ) ranked 3rd Reserve personnel 811,000  Expenditures Budget (2017) 610 billion US$ (  ) ranked 1st Percent of GDP 3.1% (2017)  Industry Domestic suppliers List Related articles History Military history of the United States Ranks Army Marine Corps Navy Air Force Coast Guard
United States Armed Forces are the  of the military forces . It consists of the United States of America , Army , Marine Corps , Navy , and Air Force . Coast Guard The  is the President of the United States of the U.S. Armed Forces and forms military policy with the Commander-in-Chief (DoD) and U.S. Department of Defense (DHS), both U.S. Department of Homeland Security , acting as the principal organs by which military policy is carried out. All five armed services are among the seven federal executive departments . uniformed services of the United States 
From the time of its inception, the U.S. Armed Forces played a decisive role in the
. A sense of national unity and identity was forged as a result of victory in the history of the United States and the First Barbary War . Even so, the Second Barbary War were suspicious of a permanent military force. It played a critical role in the founders of the United States , continuing to serve as the armed forces of the American Civil War , although a number of its officers resigned to join the United States . The military of the Confederate States , adopted following National Security Act of 1947 and during the World War II 's onset, created the modern U.S. military framework. The Act established the Cold War , headed by the Secretary of Defense; and created the National Military Establishment and the Department of the Air Force . It was amended in 1949, renaming the National Military Establishment the Department of Defense, and merged the cabinet-level Department of the Army, Department of the Navy, and Department of the Air Force, into the Department of Defense. National Security Council
The U.S. Armed Forces are one of the largest militaries in terms of the number of personnel. It draws its personnel from a large pool of paid
. Although volunteers has been used in the past in various times of both war and peace, it has not been used since 1972, but the conscription retains the power to conscript males, and requires that all male citizens and residents residing in the U.S. between the ages of 18–25 register with the service. Selective Service System 
As of 2017, the U.S. spends about US$610 billion annually to fund its military forces and
. Overseas Contingency Operations Put together, the U.S. constitutes roughly  . The U.S. Armed Forces has significant capabilities in both defense and 40 percent of the world's military expenditures due to its large budget, resulting in advanced and powerful technologies which enables a widespread deployment of the force around the world, including around 800 military bases outside the United States. power projection The U.S. Air Force is the world's largest air force, the U.S. Navy is the world's largest  by navy , and the U.S. Navy and the U.S. Marine Corps combined are the world's second largest air arm. tonnage  
The history of the U.S. Armed Forces dates to 14 June 1775, with the creation of the
, even before the Continental Army marked the establishment of the United States. The Declaration of Independence , established on 13 October 1775, and Continental Navy , established on 10 November 1775, were created in close succession by the Continental Marines in order to defend the new nation against the Second Continental Congress in the British Empire .
American Revolutionary War
These forces demobilized in 1784 after the
ended the War for Independence. The Treaty of Paris created the current Congress of the Confederation on 3 June 1784. The United States Army created the current United States Congress on 27 March 1794 and the current United States Navy on 11 July 1798. All three services trace their origins to their respective Continental predecessors. The 1787 adoption of the United States Marine Corps gave the Constitution the power to "raise and support armies", to "provide and maintain a navy" and to "make rules for the government and regulation of the land and naval forces", as well as the power to Congress . The declare war is the U.S. Armed Forces' President .
traces its origin to the founding of the United States Coast Guard on 4 August 1790 which merged with the Revenue Cutter Service on 28 January 1915 to establish the Coast Guard. The United States Life-Saving Service was established as an independent service on 18 September 1947; it traces its origin to the formation of the United States Air Force , which was formed 1 August 1907 and was part of the Aeronautical Division, U.S. Signal Corps before becoming an independent service as per the National Security Act of 1947.
Army Air Forces