The Marine Raider Regiment, formerly known as the Marine Special Operations Regiment (MSOR), is a special operations force of the United States Marine Corps, part of Marine Corps Special Operations Command (MARSOC). This unit is the principal combat component of MARSOC, which is the Marine Corps' contribution to the United States Special Operations Command (USSOCOM).

Marine Raiders are a force, expeditionary in nature, prepared to thrive in uncertain, chaotic, and austere environments, determined to excel with Spiritus Invictus – an “unconquerable spirit.”

Types of Missions:

Direct action
Special reconnaissance
Counter-terrorism
Foreign internal defense
Unconventional warfare
Security force assistance
Preparation of the environment
Counter-insurgency
Maritime Interdiction Operations
Special/Clandestine operations
Counter-drug operations