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Originally Force Recon, they are now known as Marine Corps Special Operations Command (MARSOC).
Marine Corps Special Operations Command
MARSOC (Marine Corps Forces Special Operations Command) specializes in conducting special operations missions around the world. Some of their roles include direct action missions, special reconnaissance, unconventional warfare, foreign internal defense, and counterterrorism operations. They work in collaboration with other U.S. special operations forces and partner nations to achieve mission objectives.
You're comparing apples and oranges. Special Forces is one distinct function of the Army (though the Marine Corps now does have units under the jurisdiction of SOCOM), whereas the Marine Corps is an entire branch of the service.
The primary special operations force of the USMC is simply known as MARSOC, the Marine Corps Forces Special Operations Command.Also known as Force Recon from their historic origins as an elite Marine unit that wasn't attached to the Special Forces, it is not as well known as the Army Rangers and Navy SEALs becuase it is a relatively new outfit, established in 2006. Unlike Force Recon, MARSOC was established as a full member of the United States Special Operations Command (SOCOM) so as to coordinate an increased need for joint special operations and counter-terrorism.
Marine Corps Operating Forces
The four subdivisions within the Marine Corps are: Headquarters Marine Corps (HQMC) Operating Forces Supporting Establishment Marine Forces Reserve (USMCR)
Supporting Establishment
The US Marine Corps is responsible for the amphibious training of all forces assigned to joint amphibious operation.
According to Department of Defense Directive number 5100.1, the US Marine Corps is responsible; "To organize and equip, in coordination with the other Military Services, and to provide naval forces, including naval close air support and space forces, for the conduct of joint amphibious operations, and to be responsible for the amphibious training of all forces assigned to joint amphibious operations in accordance with joint doctrines."
The U.S. Army have the U.S. Army Rangers and U.S. Army Special Forces more commonly know as the Green Berets and the U.S. Marine Corps have Recon Marines (split into Divison Recon and Force Recon), who are special forces-capable, and MARSOC, which is their contribution to SOCOM (Special Operations Command)and are up their with Navy SEALs, U.S. Army Special Forces, and Air Force Pararescue.
Marine Expeditionary Forces (MEFs)