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The U.S. Marine Corps was created on Nov. 10, 1775. It is a combined-arms task force known for its focus on aggressiveness and the offensive. The Marines have been central in developing groundbreaking tactics for maneuver warfare; they can be credited with the development of helicopter insertion doctrine and modern amphibious assault.
There are approximately 186,000 Marines actively serving today, with another 40,000 Marines serving in the U.S. Marine Corps Reserves.