Amphibious operations
Seizing and defending advanced naval bases, and conducting land operations essential to a naval campaign — the mission Congress assigned in 1947 and the reason the Corps exists as a separate service.
End strengths are FY2026 authorized (Public Law 119-60). Budget is FY2026 enacted.
The United States Marine Corps is the expeditionary service branch of the U.S. Armed Forces, raised by the Continental Congress on November 10, 1775 — traditionally at Tun Tavern in Philadelphia, where the first recruiting rendezvous was held. It is the smallest of the Department of Defense services and the only one whose minimum force structure is written into federal law.
What makes the Corps distinct is not its size but its composition. Every other service specializes in a domain. The Marine Corps deploys as a Marine Air-Ground Task Force — a self-contained package with a command element, a ground combat element, an aviation combat element and a logistics combat element, carrying its own supplies and answering to a single commander. A Marine Expeditionary Unit of roughly 2,200 Marines sails with fifteen days of sustainment aboard amphibious ships and can be ashore within hours of an order.
Congress protected that structure deliberately. Title 10, Section 8063 of the U.S. Code requires the Marine Corps to maintain not less than three combat divisions and three air wings — a floor written into the 1952 Douglas-Mansfield Act after the Corps was nearly folded into the Army following the Second World War. No other service has that guarantee.
The Corps is part of the Department of the Navy, and the relationship is operational, not administrative. Navy ships carry Marines; Navy corpsmen deploy with Marine infantry; Navy chaplains serve Marine units. Marines in turn provide the landing force that gives American naval power reach onto land.
The Marine Corps describes itself as the nation’s force in readiness. Everything about how it is organized flows from the requirement to be ready before anyone asks.
Seizing and defending advanced naval bases, and conducting land operations essential to a naval campaign — the mission Congress assigned in 1947 and the reason the Corps exists as a separate service.
Forward-deployed Marine Expeditionary Units sail continuously with amphibious ready groups, giving the United States a combined-arms force already in theater when a crisis starts.
Small, mobile, hard-to-target units operating inside contested littorals with anti-ship and air-defense missiles — the core concept behind Force Design.
The MAGTF fights as one system: infantry supported by its own artillery, armor, aviation and logistics under a single commander, without waiting for joint enablers.
Marine Security Guards protect American diplomatic posts worldwide, and Marines provide security at naval installations and for the President at Marine Barracks Washington.
Marine Raiders of MARSOC conduct direct action, special reconnaissance and foreign internal defense in support of U.S. Special Operations Command.
The Corps is organized around three Marine Expeditionary Forces, each pairing a division, an aircraft wing and a logistics group, plus a reserve mirror of all three.
Camp Pendleton, California — the Pacific-facing MEF, with 1st Marine Division.
Camp Lejeune, North Carolina — the Atlantic and Europe-facing MEF, with 2nd Marine Division.
Okinawa, Japan — the forward-deployed MEF, home to both Marine Littoral Regiments.
New Orleans — 4th Marine Division, 4th Aircraft Wing and 4th Logistics Group.
Marine Corps Forces Special Operations Command — the Raider Regiment and Raider Training Center.
Doctrine, requirements and the concepts that drive Force Design.
A MAGTF can be scaled to the mission. The three standard sizes differ in the length of time they can operate without resupply.
| Marine Expeditionary Unit (MEU) | ~2,200 Marines · 15 days sustainment | Colonel |
|---|---|---|
| Marine Littoral Regiment (MLR) | 1,800–2,000 Marines and Sailors | Colonel |
| Marine Expeditionary Brigade (MEB) | 4,000–16,000 Marines · 30 days | Brigadier general |
| Marine Expeditionary Force (MEF) | 46,000–90,000 Marines · 60 days | Lieutenant general |
The Marine Corps has spent much of its history arguing for its own existence — and winning, usually by demonstrating a capability no one else had.
The Continental Congress resolved to raise two battalions of Marines on November 10, 1775, and tradition holds that recruiting began at Tun Tavern in Philadelphia. Like the Continental Navy, the Marines were disbanded after the Revolution in 1783. Congress re-established the Corps as a permanent organization on July 11, 1798. Its early reputation was made abroad: in 1805 Lieutenant Presley O’Bannon’s Marines marched on Derna in the First Barbary War, giving the Corps “to the shores of Tripoli,” a phrase that became a motto and later the opening line of the Marines’ Hymn.
The Act for the Better Organization of the Marine Corps, signed June 30, 1834, settled decades of ambiguity by placing the Corps firmly within the Department of the Navy. The modern Corps was forged at Belleau Wood in June 1918, where the 4th Marine Brigade halted the German advance toward Paris in three weeks of fighting that produced both heavy casualties and the Devil Dogs reputation.
Between the wars a small group of officers developed amphibious assault doctrine when most military professionals considered opposed landings impossible. The Tentative Manual for Landing Operations became the intellectual basis for the Pacific campaign. The Corps peaked at 485,113 Marines in 1945, organized into six divisions and five aircraft wings. Iwo Jima, fought from February 19 to March 26, 1945, cost more than 25,000 American casualties and produced 27 Medals of Honor — more than for any other single action in American history.
The National Security Act of 1947 gave the Corps statutory protection, and the Douglas-Mansfield Act of 1952 fixed its minimum structure at three divisions and three air wings. Force Design, launched in 2020, is the most significant reorientation since: away from the large-scale land campaigns of Iraq and Afghanistan and back toward naval expeditionary warfare in contested seas.
The Continental Congress resolves to raise two battalions of Marines; Tun Tavern in Philadelphia is traditionally held as the first recruiting rendezvous.
With the Revolution over, the Continental Marines are disbanded alongside the Continental Navy.
Congress formally re-establishes the Marine Corps as a permanent military organization.
Lieutenant Presley O’Bannon’s Marines march on Derna in the First Barbary War, earning the phrase that became a motto.
The Act for the Better Organization of the Marine Corps places the Corps within the Department of the Navy.
The emblem is adopted, combining the eagle for national service, the globe for worldwide reach and the anchor for the Corps’ naval character.
Always Faithful is adopted as the Corps motto, replacing a series of earlier unofficial ones.
The 4th Marine Brigade halts the German advance toward Paris, establishing the Corps as a modern combat force.
Commandant John A. Lejeune orders the Corps’ birthday read aloud to every command each year — the origin of the modern Birthday Ball.
The costliest battle in Marine Corps history produces 27 Medals of Honor and the most reproduced photograph of the war.
The National Security Act, and then the Douglas-Mansfield Act, fix the Corps at not less than three divisions and three air wings.
The Corps divests tanks and heavy artillery for long-range missiles and sensors, standing up Marine Littoral Regiments for operations inside contested island chains.
Since 2020 the Corps has been executing Force Design, the most sweeping redesign in its modern history. It divested tanks, cut artillery tubes and reduced end strength in order to buy long-range missiles, sensors and mobility for fighting inside contested island chains. An October 2025 update trimmed the plan from three Marine Littoral Regiments to two plus a reinforced infantry regiment.
Roughly 1,800 to 2,000 Marines and Sailors built for island operations — 3rd MLR in Hawaii and 12th MLR on Okinawa, both in III MEF.
The Naval Strike Missile mounted on an unmanned JLTV chassis, giving small Marine units the ability to threaten warships from shore.
The Marine Air Defense Integrated System, fielded from December 2024, provides short-range air and counter-drone protection for dispersed units.
An expeditionary multirole radar that gives littoral units their own air and counter-battery picture without reachback.
The replacement for the AAV in its personnel, command and 30mm gun variants, restoring armored mobility from ship to shore.
Heavy-lift rotary wing and a new shallow-draft connector — the mobility that makes dispersed island operations sustainable.
The Marine Corps keeps the full warrant officer ladder that the Navy dropped, and splits both its E-8 and E-9 grades into a technical track and a command track. A Master Sergeant and a First Sergeant are the same pay grade doing different jobs; so are a Master Gunnery Sergeant and a Sergeant Major.
Warrant officers commissioned from the enlisted ranks include the Marine Gunner, an infantry weapons specialist marked by a bursting bomb insignia. Devices shown are schematic diagrams of each pay-grade tier, not reproductions of official insignia artwork.
No service guards its symbols more closely. Marine identity is taught explicitly in recruit training, and the emblem is earned rather than issued.
Scarlet and gold, designated by Marine Corps Order No. 4 on April 18, 1925. The modern battle color design was approved on January 18, 1939 after a two-year study.
Adopted November 19, 1868. The eagle signifies service to the nation, the globe worldwide reach, and the anchor the Corps’ amphibious and naval character. The original crested eagle was replaced with the American bald eagle by executive order on June 22, 1954.
Always Faithful, adopted around 1883. It replaced a run of earlier mottos including Fortitudine, By Sea and by Land, and the Tripoli and Montezumas phrases that survive in the Hymn.
Commandant John A. Lejeune’s Marine Corps Order No. 47 of 1921 directed that the Corps’ birthday be read aloud at every command each November 10. At the cake cutting, the first piece goes to the guest of honor and the second to the oldest Marine present, who passes a piece to the youngest.
The oldest official song in the U.S. armed forces. Semper Fidelis, composed by John Philip Sousa, is the official march. Marines stand at attention whenever the Hymn is played.
Honor, Courage, Commitment. Recruits receive the Eagle, Globe and Anchor only after completing the Crucible, a 54-hour culminating field exercise — the moment they are first addressed as Marines.
November 10, 1775, when the Continental Congress resolved to raise two battalions of Marines. Tradition holds that recruiting began at Tun Tavern in Philadelphia. The Corps was disbanded in 1783 and permanently re-established on July 11, 1798.
Congress authorized 172,300 active-duty Marines and 33,600 in the Marine Corps Reserve for fiscal year 2026, supported by about 20,700 civilians. The Marine Corps is the smallest of the Department of Defense services.
Semper Fidelis — Latin for Always Faithful, adopted around 1883 and universally shortened to Semper Fi. Earlier unofficial mottos included Fortitudine, By Sea and by Land, and To the Shores of Tripoli.
Adopted in 1868, the emblem combines three symbols: the eagle for service to the nation, the globe for the Corps’ worldwide reach, and the anchor for its naval and amphibious character. Recruits do not receive it until they complete the Crucible at the end of recruit training.
A Marine Air-Ground Task Force — the standard way every Marine force deploys. It combines four elements under one commander: a command element, a ground combat element, an aviation combat element and a logistics combat element. Sizes range from a 2,200-Marine Expeditionary Unit to a Marine Expeditionary Force of up to 90,000.
Enlisted ranks run Private, Private First Class, Lance Corporal, Corporal, Sergeant, Staff Sergeant, Gunnery Sergeant, then Master Sergeant or First Sergeant, then Master Gunnery Sergeant or Sergeant Major. Warrant officers run WO1 through CWO5. Officers run Second Lieutenant through General.
The Marine Corps is a separate armed service within the Department of the Navy. It has its own Commandant, who sits on the Joint Chiefs of Staff, and its own budget line — but it shares a department, and its ships, medical personnel and chaplains come from the Navy.
Scarlet and gold, formally designated by Marine Corps Order No. 4 in April 1925 and carried through the Corps’ flag, dress uniforms and heraldry ever since.
After the Second World War there were serious proposals to fold the Corps into the Army. Congress responded with the National Security Act of 1947 and the Douglas-Mansfield Act of 1952, which set a statutory floor of three combat divisions and three air wings — now codified at Title 10, Section 8063. No other service has that protection.
The Marine Corps’ ongoing restructuring, launched in 2020, that trades tanks and heavy artillery for long-range anti-ship missiles, sensors and mobility suited to operating inside contested island chains. Its centerpiece is the Marine Littoral Regiment, of which two now exist in III Marine Expeditionary Force.
Sparta Pewter USA builds custom coins, awards, gifts and unit recognition pieces for the U.S. Marine Corps.