46 CFR 12.703: General requirements for entry-level ratings.

(a) Rating endorsements will be issued without professional examination to applicants in capacities other than Able Seafarer, Lifeboat Operator, Lifeboat Operator-Limited, tank vessel endorsement, or QMED, including—

(1) Ordinary Seafarer;

(2) Wiper;

(3) Steward's Department; and

(4) Steward's Department (F.H.).

(b) Holders of MMCs or MMDs endorsed as Ordinary Seafarer may serve in any unqualified rating in the deck or steward's department, except as a Food Handler (F.H.).

(c) Holders of MMCs or MMDs endorsed as Wiper may serve in any unqualified rating in the engine or steward's department, except as a Food Handler.

(d) Only MMCs or MMDs endorsed as Steward's Department (F.H.) will authorize the holder's service in any capacity in the steward's department, including Food Handler.