((a)) Nothing contained in this subchapter shall be construed so as to limit, restrict, deny, or affect the coming into or departure from the United States of an alien member of the Armed Forces of the United States who is in the uniform of, or who bears documents identifying him as a member of, such Armed Forces, and who is coming to or departing from the United States under official orders or permit of such Armed Forces: That nothing contained in this section shall be construed to give to or confer upon any such alien any other privileges, rights, benefits, exemptions, or immunities under this chapter, which are not otherwise specifically granted by this chapter.
((b)) If a person lawfully admitted for permanent residence is the spouse or child of a member of the Armed Forces of the United States, is authorized to accompany the member and reside abroad with the member pursuant to the member’s official orders, and is so accompanying and residing with the member (in marital union if a spouse), then the residence and physical presence of the person abroad shall not be treated as—
((1)) an abandonment or relinquishment of lawful permanent resident status for purposes of clause (i) of ; or
((2)) an absence from the United States for purposes of clause (ii) of such section.