46 CFR § 90.10-42 - Tankerman.
The following ratings are established in part 13 of this chapter. The terms for the ratings identify persons holding valid merchant mariners' documents for service in the ratings issued under that part:
(b) Tankerman-PIC (Barge).
(c) Restricted Tankerman-PIC.
(d) Restricted Tankerman-PIC (Barge)