41 CFR § 51-5.2 - Mandatory source requirement.
(a) Nonprofit agencies designated by the Committee are mandatory sources of supply for all entities of the Government for commodities and services included on the Procurement List, as provided in § 51–1.2 of this chapter.
(b) Purchases of commodities on the Procurement List by entities of the Government shall be made from sources authorized by the Committee. These sources may include nonprofit agencies, central nonprofit agencies, Government central supply agencies such as the Defense Logistics Agency and the General Services Administration, and certain commercial distributors. Identification of the authorized sources for a particular commodity may be obtained from the central nonprofit agencies at the addresses noted in § 51–6.2 of this chapter.
(c) Contracting activities shall require other persons providing commodities which are on the Procurement List to entities of the Government by contract to order these commodities from the sources authorized by the Committee.
(d) Procedures for obtaining military resale commodities are contained in § 51–6.4 of this chapter.
(e) Contracting activities procuring services which have included within them services on the Procurement List shall require their contractors for the larger service requirement to procure the included Procurement List services from nonprofit agencies designated by the Committee.