The U.S. Marine Corps is one of the military branches protecting the United States.
While Cate Archer was infiltrating a secret H.A.R.M. underground base located behind the Dumas Lumber Company facility in Washington, she overheard two ex-U.S. Marines talking about their time in the Korean War. One was talking about how a loudmouth member of his unit had his lower jaw shot off by the North Korean Army.
United States Marine Corps on Wikipedia