Certificates will be required as follows:

(a) Ocean transportation. The supplier of ocean transportation will execute Form AID 1550-1, entitled “Voluntary Agency and Carrier Certificate,” in an original and two copies.

(b) Inland transportation and related shipping costs. Where inland transportation, including related shipping costs, is reimbursable under provisions of §202.3, the representative of the agency will execute Form AID 1550-1, entitled “Voluntary Agency and Carrier Certificate,” in an original and two copies when, in the absence of published tariffs or a prevailing rate, it is necessary to negotiate for the shipment of the supplies.