48 CFR §225.401

1. (a)
   1. (2)
      1. (A)If a department or agency considers an individual acquisition of a product to be indispensable for national security or national defense purposes and appropriate for exclusion from the provisions of FAR subpart 25.4, it may submit a request with supporting rationale to the Principal Director, Defense Pricing, Contracting, and Acquisition Policy (DPCAP), Office of the Under Secretary of Defense (Acquisition and Sustainment) (OUSD(A&S)DPCAP). Approval by OUSD(A&S)DPCAP is not required if—
         1. (1)Purchase from foreign sources is restricted by statute (see subpart 225.70);
         2. (2)Another exception in FAR 25.401 applies to the acquisition; or
         3. (3)Competition from foreign sources is restricted under subpart 225.71.
      2. (B)Public interest exceptions for certain countries when acquiring products or services in support of operations in Afghanistan are in 225.7704-1.