{"data":{"id":"us/46-cfr-10.207","jurisdiction":"us","citation":"46 CFR 10.207","heading":"Identification number.","body":"For recordkeeping purposes only, a mariner's official MMC identification number is the individual's social security number. However, a unique serial number, called the mariner reference number, and not the social security number, will appear on the credential.","path":["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"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"f959ef5cc32f97a5aee33e6fd864399a6787b48bbc9535ade2b1b5417ae82960","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-10.205","next":"us/46-cfr-10.209"},"notice":"GroundRules: Original legal text. Not legal advice."}