A Maritime Special Purpose Force (MSPF) is a United States Marine Corps specialized sub-unit of a Marine expeditionary unit. A MSPF is deployed to give the commanders low profile, two-platoon surgical emplacement in the accessible littoral regions. The MSPF provides the enhanced operational capability and precision skills to complement, enable, and execute selected conventional, maritime special operations. They can also perform operations not resident in traditional amphibious raid companies.

Marine expeditionary unit (special operations capable) (MEU(SOC)) is a program created by the United States Marine Corps (USMC) and the United States Navy (USN) in 1985 for Marine expeditionary units (MEU). The program enhances MEUs providing them with additional training and equipment to become certified as special operations capable with a Maritime Special Purpose Force (MSPF). The designation special operations capable is unique to the Marine Corps and means in relation to special operations. The role of a MEU(SOC) however is not equivalent to the special operations role of special operations forces. Although considered special operations capable a MEU(SOC) does not form part of the United States Special Operations Command (USSOCOM) established in 1987 or the United States Marine Forces Special Operations Command (MARSOC) later established in 2006.