United States Marine Corps 22nd Marine Amphibious Unit

United States Marine Corps 22nd Marine Amphibious Unit
Unit name	22nd Marine Amphibious Unit
Country	United States
Branch	United States Marine Corps
Type	Amphibious unit
Role	Expeditionary operations
Size	~1,800 personnel
Command structure	Fleet Marine Force
Garrison	Camp Lejeune, Naval Amphibious Base Little Creek
Notable commanders	Major General Louis H. Wilson Jr., Brigadier General James L. Day
Battles	Vietnam War, Operation Frequent Wind

United States Marine Corps 22nd Marine Amphibious Unit

The 22nd Marine Amphibious Unit served as a United States Marine Corps expeditionary organization configured for sea-based amphibious assault and crisis response, operating in conjunction with United States Navy amphibious forces and Fleet Marine Force Atlantic. Formed during the Cold War era, the 22nd MAU participated in regional contingencies, rapid-reaction deployments, and joint operations alongside units from United States Army, United States Air Force, and allied forces such as Royal Navy and Australian Army elements.

History and Formation

The 22nd MAU traces its lineage to post-World War II amphibious concepts developed by United States Fleet Training Group Atlantic, evolving through doctrinal influences from the Amphibious Warfare School, Expeditionary Strike Group experimentation, and lessons from the Korean War and Vietnam War. Organizational predecessors included Special Landing Force detachments and numbered Marine Expeditionary Unit prototypes fielded during the 1950s and 1960s alongside Amphibious Ready Group formations embarked on USS Pocono (AGC-16), USS Okinawa (LPH-3), and USS Iwo Jima (LPH-2). Cold War geopolitics, including crises such as the Cuban Missile Crisis and tensions in the Mediterranean Sea, shaped the MAU's standing readiness and forward-deployment patterns with Sixth Fleet and Second Fleet task groups.

Organization and Structure

As an amphibious unit, the 22nd MAU adopted the standardized triangular composition found in Marine Air-Ground Task Force doctrine: a reinforced infantry battalion as the Ground Combat Element, a composite Marine Medium Helicopter Squadron or Marine Attack Squadron detachment as the Aviation Combat Element, and a Combat Service Support element drawn from Marine Logistics Group assets. Command relationships tied the 22nd MAU to Amphibious Squadron commands and amphibious assault ships such as USS Nassau (LHA-4), USS Guadalcanal (LPH-7), and later Tarawa-class or Wasp-class vessels. The unit integrated staff functions influenced by Joint Staff (United States) doctrine, with liaison channels to Naval Coastal Warfare units and Military Sealift Command.

Deployments and Operations

The 22nd MAU executed deployments supporting operations in Southeast Asia, contingency evacuations, and show-of-force missions in the Mediterranean Sea and Western Pacific. Notable operations included participation in theater cooperation with Republic of Korea Armed Forces exercises, humanitarian assistance linked to Operation Sea Angel-style missions, and rapid evacuation responsibilities exemplified by Operation Frequent Wind and other noncombatant evacuation operations alongside United States Embassy contingents. Engagements with Vietnam War combat operations, coastal interdictions, and littoral security patrols brought the 22nd MAU into coordination with Seventh Fleet task forces and allied navies during bilateral exercises such as Exercise Team Spirit and Bright Star.

Equipment and Aircraft

The 22nd MAU employed a mix of amphibious and aviation platforms, including LVTP-7 armored personnel carriers, AAVP-7A1 amphibious assault vehicles, M60 Patton and later M48 Patton tanks in armored platoons, and logistics vehicles from 6x6 truck inventories. Aviation assets commonly embarked were CH-46 Sea Knight medium-lift helicopters, CH-53 Sea Stallion heavy-lift helicopters, AH-1 Cobra attack helicopters, and AV-8B Harrier II jets when available for expeditionary fixed-wing support. Shipborne support came from assault ships like Landing Helicopter Assault and Landing Platform Dock classes, amphibious transport docks USS New York (LPD-21), and command vessels coordinating with Carrier Strike Group escorts.

Training and Tactics

Training emphasized amphibious assault techniques developed at Naval Amphibious Base Coronado and Camp Pendleton, combined-arms integration taught at the School of Infantry and Marine Corps Warfighting Laboratory, and interoperability rehearsals with United States Navy SEALs and Special Forces. Tactics included vertical envelopment, littoral maneuver, ship-to-shore logistics using Landing Craft Air Cushion and conventional LCU platforms, and close air support coordination with Marine Aviation Weapons and Tactics Squadron One (MAWTS-1). Exercises incorporated doctrine from Amphibious Ready Group operating concepts, Joint Task Force planning, and contingency response scenarios modeled on lessons from Operation Desert Shield and Operation Restore Hope.

Notable Personnel and Leadership

Commanders and officers associated with the MAU system included leaders who later served in senior roles such as Commandant of the Marine Corps figures, decorated veterans from Vietnam War engagements, and recipients of the Medal of Honor and Navy Cross serving across MAU billets. Senior noncommissioned officers and aviators who contributed to doctrine included individuals tied to Marine Corps Aviation development and Marine Corps Combat Development Command curricula, while planners liaised with United States Transportation Command and Naval Surface Forces leadership during deployments.

Legacy and Disbandment

The 22nd MAU's legacy lies in its contribution to expeditionary doctrine that informed the modern Marine Expeditionary Unit and Marine Expeditionary Brigade constructs, influencing amphibious warfare concepts adopted across NATO and allied amphibious forces. Organizational lessons fed into reforms at Headquarters Marine Corps and operational concepts tested by Fleet Marine Force Pacific and Fleet Marine Force Atlantic, even as force reconfigurations, budgetary pressures, and shifting strategic priorities led to reflagging, consolidation, or disbandment of numbered MAUs in favor of permanent Marine Expeditionary Unit designations and Expeditionary Advanced Base Operations experimentation.

Category:Units and formations of the United States Marine Corps Category:Amphibious units