Except as provided in subsection (c) of this section, an individual described in section
12602
(a) of this title who successfully completes a required term of part-time national service in an approved national service position shall receive a national service educational award having a value, for each of not more than 2 of such terms of service, equal to 50 percent of value of the national service educational award determined under subsection (a) of this section.