10 U.S.C. § 2424

(a) Authority .— The Secretary of Defense may authorize an element of the Department of Defense to enter into a contract (through the use of procedures other than competitive procedures) with an exchange store operated under the jurisdiction of the Secretary of a military department outside the United States to procure supplies or services for use by the armed forces outside the United States. (b) Limitations .— (1) A contract may not be entered into under subsection (a) in an amount in excess of $100,000. (2) Supplies provided under a contract entered into under subsection (a) shall be provided from the stocks of the exchange store on hand as of the date the contract is entered into with that exchange store. (3) A contract entered into with an exchange store under subsection (a) may not provide for the procurement of services not regularly provided by that exchange store. (c) Exception .— Paragraphs (1) and (2) of subsection (b) do not apply to contracts for the procurement of soft drinks that are manufactured in the United States. The Secretary of Defense shall prescribe in regulations the standards and procedures for determining whether a particular beverage is a soft drink and whether the beverage was manufactured in the United States.