41 C.F.R. § 109-40.306-2
(a) To qualify for transportation under section 10721 rates, property must be shipped by or for the Government on:
(3) Commercial bills of lading showing that the Government is either the consignor or the consignee and endorsed with the following statement:
Transportation hereunder is for the U.S. Department of Energy, and the actual total transportation charges paid to the carrier(s) by the consignor or consignee are assignable to, and are to be reimbursed by, the Government.
(b) When a rate tender is used for transportation furnished under a cost-reimbursable contract, the following endorsement shall be used on covering commercial bills of lading:
Transportation hereunder is for the U.S. Department of Energy, and the actual total transportation charges paid to the carrier(s) by the consignor or consignee are to be reimbursed by the Government, pursuant to cost-reimbursable contract number (insert contract number). This may be confirmed by contacting the agency representative at (name and telephone number).
See 332 ICC 161.