46 USC 7306 - General requirements and classifications for able seamen

(a) To qualify for an endorsement as able seaman authorized by this section, an applicant must provide satisfactory proof that the applicant
(1) is at least 18 years of age;
(2) has the service required by the applicable section of this part;
(3) is qualified professionally as demonstrated by an applicable examination or educational requirements; and

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(4) is qualified as to sight, hearing, and physical condition to perform the seamans duties.
(b) The classifications authorized for endorsement as able seaman are the following:
(1) able seamanunlimited.
(2) able seamanlimited.
(3) able seamanspecial.
(4) able seamanoffshore supply vessels.
(5) able seamansail.
(6) able seamanfishing industry.