CFR /  Title 46  /  Part 97  /  Sec. 97.53-1 Officers.

All officers on a vessel must have their licenses or officer endorsements conspicuously displayed. [USCG-2006-24371, 74 FR 11265, Mar. 16, 2009]

Subpart 97.55_De-Energizing of Cargo Hold Lighting Circuits When Grain

or Other Combustible Bulk Cargo Is Carried