On March 1, 2024, the U.S. Coast Guard began issuing Merchant Mariner Credentials (MMCs) in a new single-sheet format. This new mariner credential replaced the legacy passport-style red book and associated endorsement labels.
Based on processing observations and customer feedback, the stock used for the new MMC is being upgraded to one that is significantly more tear resistant. All other appearance and security features remain the same. The new MMC remains formatted on 8.5” x 11” waterproof and tear-resistant synthetic stock and is far more durable than the previous paper licenses or passport-style books issued in years past. To learn more about the new MMC, visit the National Maritime Center (NMC) website.
The updated MMC document will be issued for all approved applications, to include credential endorsements, beginning July 8, 2024.
To validate a new MMC, use the Coast Guard’s credential verification tool at MMLD Credential Verification (uscg.mil). For a document search, select “MMC” as the document type and enter the document number. On the new MMC, the document number can be found on the red cover section beneath the corresponding barcode and will have the prefix “Z”.
If you have any questions, contact the NMC Customer Service Center by e-mailing IASKNMC@uscg.mil or calling 1-888-IASKNMC (427-5662).