In the case of a member of the Selected Reserve of a reserve component who no longer meets the qualifications for membership in the Selected Reserve solely because the member is unfit because of physical disability, the Secretary concerned may, for purposes of
section 12731 of this title, determine to treat the member as having met the service requirements of subsection (a)(2) of that section and provide the member with the notification required by subsection (d) of that section if the member has completed at least 15, and less than 20, years of service computed under
section 12732 of this title.