46 CFR §13.201

1. (a)Be at least 18 years old;
2. (b)Apply on a form provided by the Coast Guard;
3. (c)Provide evidence of—
   1. (1)Passing a physical and medical examination in accordance with § 13.125;
   2. (2)Service on tankships in accordance with § 13.203;
   3. (3)Completion of an approved firefighting course that provides training in the subjects listed in table 3 to § 13.121(e) completed within 5 years of the date of application for the endorsement, unless they have previously submitted such a certificate for tank vessel endorsement or officer endorsement on an MMC; and
   4. (4)Completion of an approved course for Tankship: Dangerous Liquids or Tankship: Liquefied Gases appropriate to the endorsement applied for within the previous 5 years. A course certificate used for original issuance or renewal of an endorsement cannot be used for a subsequent renewal of the same endorsement; and
4. (d)Be capable of speaking and understanding, in English, all instructions needed to commence, conduct, and complete a transfer of cargo, and be capable of reading and understanding the English language found in the Declaration of Inspection, vessel response plans, and Material Safety Data Sheet.