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.
Due to a special agreement between certain countries (including Taiwan) and the United States, passport holders of these countries may enter the United States with passports that will expire in less than 6 months. However, they will not be permitted to remain in the U.S. beyond the validity of their passports.