U.S. Military Branches
Explore all six branches of the U.S. Armed Forces — their history, mission, ranks, and traditions.
The United States Armed Forces consist of six military branches, each with a distinct mission, culture, and chain of command. The U.S. Armyis the nation’s oldest and largest land-combat force, tracing its roots to 1775. The U.S. Navy projects power at sea and from the sea across every ocean. The U.S. Marine Corps, though administratively part of the Department of the Navy, operates as an independent expeditionary fighting force. The U.S. Air Forcecontrols the skies, delivers global airlift, and maintains the nuclear triad’s airborne leg. The U.S. Space Force — the newest branch, stood up in December 2019 — operates and defends military satellites and space assets. Finally, the U.S. Coast Guard serves under the Department of Homeland Security in peacetime, enforcing maritime law, conducting search-and-rescue, and protecting U.S. ports. Together the six branches employ roughly 1.3 million active-duty servicemembers and 800,000 National Guard and Reserve personnel.
U.S. Army
Founded June 14, 1775
The U.S. Army protects and defends the United States and its interests through decisive land-power operations.
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U.S. Navy
Founded October 13, 1775
The U.S. Navy maintains, trains, and equips combat-ready naval forces capable of winning wars, deterring aggression, and maintaining freedom of the seas.
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U.S. Marine Corps
Founded November 10, 1775
The Marine Corps provides power projection from the sea, using the mobility of the Navy to deliver combined-arms task forces rapidly.
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U.S. Air Force
Founded September 18, 1947
The Air Force flies, fights, and wins in air, space, and cyberspace to defend the United States.
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U.S. Space Force
Founded December 20, 2019
The Space Force organizes, trains, and equips Guardians to protect U.S. interests in space and provide space capabilities to the joint force.
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U.S. Coast Guard
Founded August 4, 1790
The Coast Guard protects the public, environment, and U.S. economic and security interests in maritime regions, both domestically and internationally.
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Army, Navy, Marines, Air Force, Space Force & Coast Guard — At a Glance
Each branch recruits, trains, and organizes its personnel differently. The Army is built around infantry, armor, artillery, and aviation units organized into brigades and divisions. The Navy revolves around carrier strike groups, submarine squadrons, and Naval Special Warfare (SEALs). The Marine Corps deploys as Marine Expeditionary Units (MEUs) — self-contained air-ground task forces that can operate from amphibious ships. The Air Force organizes around wings and numbered air forces operating fighters, bombers, tankers, and intercontinental ballistic missiles. The Space Force is the smallest branch, with roughly 9,000 active-duty Guardians managing satellite communications, GPS, missile warning, and space domain awareness. The Coast Guard uniquely blends military and law-enforcement authorities, operating cutters, aircraft, and boat stations at every major U.S. port. Click any branch card above to explore its full history, mission, and career paths.
Military Ranks: Enlisted, Warrant Officer, and Officer
All six branches share the same basic rank structure: enlisted grades (E-1 through E-9), warrant officer grades (W-1 through W-5, used by Army, Navy, Marine Corps, and Coast Guard), and commissioned officer grades (O-1 through O-10). Enlisted servicemembers form the backbone of every branch, holding specialties from infantryman to cryptologic technician to hospital corpsman. Warrant officers are technical experts — helicopter pilots, special operations aviators, and cyber-operations specialists. Commissioned officers enter with a college degree, typically via a service academy, ROTC program, or Officer Candidate School. Pay scales are set by Congress and indexed annually; base pay ranges from roughly $1,800 per month for an E-1 to over $17,000 per month for a four-star general or admiral. Explore the complete rank tables →
How to Join the U.S. Military
Enlisting in the military requires U.S. citizenship or permanent resident status, a high school diploma (GED accepted by some branches), passing the Armed Services Vocational Aptitude Battery (ASVAB), and meeting physical and medical standards under the Military Entrance Processing Standards (MEPS). Each branch sets its own minimum ASVAB scores for specific military occupational specialties (MOS/rate/AFSC). Enlistment contracts typically run four to six years of active duty, with additional Reserve or National Guard obligations. Prospective officers commissioning through ROTC or OCS generally commit to four or five years. Service academy graduates (West Point, Annapolis, Air Force Academy, Coast Guard Academy, Merchant Marine Academy) serve a minimum of five years on active duty after commissioning. Compare branch requirements →
Choosing a Branch: Culture, Mission, and Career Fit
Choosing a branch is one of the most consequential decisions a military recruit can make. Each service has a distinct culture, deployment tempo, and career specialization ecosystem. The Army offers the widest variety of occupational specialties and the most geographically distributed bases. The Navy and Marine Corps offer overseas deployments to the Pacific, Mediterranean, and beyond — often aboard ship. The Air Force is known for quality-of-life infrastructure and technical specialties in aviation and cyber. The Space Force offers highly technical billets in a fast-growing domain with a tight-knit community. The Coast Guard is mission-focused on maritime law enforcement and humanitarian response with a distinctly different peacetime operating environment. Our branch comparison tool lets you place any two branches side-by-side across strength, budget, history, and culture metrics. See rank and pay breakdowns →
Official Resources
WAR.gov — Official Military Resources