The CO should prepare the NORI for the signature of the Regional Director, or designee. After being signed, the original NORI will remain in the case file. The CO will send copies of the NORI to the complainant and the contractor with a letter of transmittal, sent certified mail, return receipt requested. The CO will provide copies of the NORI to the regional office. The CO should annotate the Case Chronology Log to reflect the transmission and, as appropriate, the receipt of the document.