46 C.F.R. § 4.11-1 Employees of vessels controlled by Army or Navy as witnesses.
Title 46 - Shipping
No officer, seaman, or other employee of any public vessel controlled by the Army or Navy (not including the Coast Guard) of the United States, shall be summoned or otherwise required to appear as a witness in connection with any investigation or other proceeding without the consent of the Government agency concerned.
Title 46: Shipping
PART 4—MARINE CASUALTIES AND INVESTIGATIONS
Subpart 4.11—Witnesses and Witness Fees
§ 4.11-1 Employees of vessels controlled by Army or Navy as witnesses.