Pub. L. 89-687, tit. VI, sec. 631

Sec. 631. Not to exceed $11,746,000 of the funds made available in this Act for the purpose shall be available for the hire of motor vehicles: Provided, That the Secretary of Defense, under circumstances where the immediate movement of persons is imperative, may, if he deems it to be in the national interest, hire motor vehicles for such purposes without regard to this limitation.