During the American Revolution, the Continental Congress passes a resolution stating that “two Battalions of Marines be raised” for service as landing forces for the recently formed Continental Navy. The resolution, drafted by future U.S. president John Adams and adopted in Philadelphia, created the Continental Marines and is now observed as the birth date of the United States Marine Corps.
Today, there are more than 200,000 active-duty and reserve Marines, divided into four divisions stationed at Camp Lejeune, North Carolina; Camp Pendleton, California; New Orleans, Louisiana; and Okinawa, Japan. Each division has one or more expeditionary units, ready to launch major operations anywhere in the world on two weeks’ notice. Marines expeditionary units are self-sufficient, with their own tanks, artillery, and air forces. The motto of the service is Semper Fidelis, meaning “Always Faithful” in Latin.
FROM: https://www.history.com/this-day-in-history/birth-of-the-u-s-marine-corps