48 CFR § 6.302-4 - International agreement.
(2) Full and open competition need not be provided for when precluded by the terms of an international agreement or a treaty between the United States and a foreign government or international organization, or the written directions of a foreign government reimbursing the agency for the cost of the acquisition of the supplies or services for such government.
(b) Application. This authority may be used in circumstances such as -
(1) When a contemplated acquisition is to be reimbursed by a foreign country that requires that the product be obtained from a particular firm as specified in official written direction such as a Letter of Offer and Acceptance; or
(2) When a contemplated acquisition is for services to be performed, or supplies to be used, in the sovereign territory of another country and the terms of a treaty or agreement specify or limit the sources to be solicited.