Under such regulations as the Secretary of the Army may prescribe under
section 7721(d) of this title, the Secretary of the Army may authorize the removal of the remains of a person described in subsection (c) from one of the Cemeteries for re-interment or re-inurnment if, upon the death of the primary person eligible for interment or inurnment in the Cemeteries, the deceased primary eligible person will not be buried in the same or an adjoining grave.