The Colonial Marine Corps is a branch of the Colonial Forces tasked with ground combat operations and ship-board security.
A Marine's duties include guarding the CIC and the brig as well as other critical areas on the ship, and assisting the Master-At-Arms and are part of Raptor boarding parties. Naturally, they are also responsible for repelling enemy boarding actions. The Commanding Officer's quarters are constantly under marine guard, and the same is true for high-ranking Government officials when aboard ship. A Marine is also tasked with serving the commander's food.
Marines are evidently untrained in crowd control. In these situations Marines react with little discipline to enraged crowds.
Colonial Marines are also called "jarheads". Like the Colonial Fleet, the Corps has a reserve component.
See Category:Ranks for details.