Pub. L. 83-179, tit. VI, sec. 640

Sec. 640. No part of the funds appropriated in this or any other Act shall be available for the payment to any person in the military service who is resident of a United States Territory or possession, of any foreign duty allowances above the authorized allowances for comparable rating in the continental United States unless such person is serving in an area outside the Territory or possession of which lie is a resident.