The Corps shall consist of individuals between the ages of 16 and 25, inclusive, who are enrolled as participants in the Corps by the Secretary. To be eligible for enrollment in the Corps, an individual shall satisfy the criteria specified in section
12591
(b) of title
42. The Secretary may enroll such individuals in the Corps without regard to the civil service and classification laws, rules, or regulations of the United States. The Secretary may establish a preference for the enrollment in the Corps of individuals who are economically, physically, or educationally disadvantaged.