It is possible for a vessel to be deleted from documentation upon the request of the vessel owner, or an authorized agent on behalf of the owner. The request must be submitted in writing, and it must include the vessel's official number, as well as the reason for deletion. The original Certificate of Documentation (CERTIFICATE OF DOCUMENTATION) is to be returned by the owner named on the certificate. Please provide any evidence of sale or transfer, AND a statement indicating the nationality of the owner and/or the country in which the vessel will be flagged (in the event the vessel is being sold to non-US citizen(s) or being flagged in a foreign country). Evidence of sale is required in the event vessel is sold foreign as per 46 CFRn67.171(c)(1). A Certificate of Documentation (CERTIFICATE OF DOCUMENTATION) is invalid and the vessel is subject to deletion from the roll of actively documented vessels when any of the situations listed in 46 CFR 67.171 occurs.