Enlisted Marine Corps ranks are broken down into three levels, Junior Enlisted, Non-Commissioned Officers, and Staff Non-Commissioned Officers. As a Marine moves up the ladder his or her responsibility and contribution to the mission increases.
Also, children born abroad to two non-citizen nationals or to one alien parent and one non-citizen national parent are eligible for non-citizen national status. This is so rare that the State Department does not even issue a certificate for it. Non-citizen nationals are delineated as such in their passports.
WHTI, which was fully implemented in June, 2009, required that all U.S. citizens, and those of Canada and Bermuda, reentering the U.S. have a valid passport. However, to ease the burden for those U.S. citizens only traveling to Canada, Mexico, Bermuda, and the Caribbean, the passport card was created.