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- "Semper Fidelis."
- — United States Marine Corps motto
The United States Marine Corps or USMC is the United States Military's amphibious combined arms branch. The USMC appears as a faction in Call of Duty 4: Modern Warfare, Call of Duty: World at War, Call of Duty: Modern Warfare 2, Call of Duty: Black Ops and Call of Duty: Modern Warfare 3.