Pub. L. 91-171, tit. VI, sec. 639

Sec. 639. During the current fiscal year, cash balances in working capital funds of the Department of Defense established pursuant to section 2208 of title 10, United States Code, may be maintained in only such amounts as are necessary at any time for cash disbursements to be made from such funds: Provided, That transfers may be made between such funds in such amounts as may be determined by the Secretary of Defense, with the approval of the Bureau of the Budget.