46 C.F.R. § 10.221 Parting with license.
Title 46 - Shipping
The holder of a license shall not voluntarily part with it or place it beyond his or her personal control by pledging or depositing it with any other person for any purpose. If the holder violates this section, he or she may be proceeded against in accordance with the provisions of part 5 of this chapter, looking to a suspension or revocation of the license.
Title 46: Shipping
PART 10—LICENSING OF MARITIME PERSONNEL
Subpart B—General Requirements for All Licenses and Certificates of Registry
§ 10.221 Parting with license.

