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.
U.S. Passports. If you are a U.S. citizen, you can choose to travel with a U.S. passport instead of other forms of photo ID. Show your U.S. passport and enter through the domestic traveler lanes at Puerto Rican immigration control..S. Citizens. U.S. citizens must have a state-issued photo identification, like a driver's license or department of motor vehicles-issued non-driving photo ID, to enter Puerto Rico. This requirement is the same as for air passengers traveling within the continental United States.