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Title 46: Shipping
CHAPTER I: COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
SUBCHAPTER B: MERCHANT MARINE OFFICERS AND SEAMEN
PART 10: MERCHANT MARINER CREDENTIAL
Subpart B: General Requirements for All Merchant Mariner Credentials
10.207 - Identification number.
For recordkeeping purposes only, a mariner's official MMC identification number is the individual's social security number. However, a unique serial number, and not the social security number, will appear on the credential.
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