Pub. L. 86-601, tit. V, sec. 504

Sec. 504. Any appropriation available to the Army, Navy, or the Air Force may, under such regulations as the Secretary concerned may prescribe, be used for expenses incident to the maintenance, pay, and allowances of prisoners of war, other persons in Army, Navy, or Air Force custody whose status is determined by the Secretary concerned to be similar to prisoners of war, and persons detained in such custody pursuant to Presidential proclamation.