service described in section 210(a)(14)(B) performed by an individual who has attained the age of eighteen, (B) service described in section 210(a)(16), (C) service described in section 210(a)(11), (12), or (15) performed in the United States by a citizen of the United States, except service which constitutes ???employment??? under section 210(r), (D) service described in paragraph (4) of this sub