32 C.F.R. § 700.703 To announce assumption of command.
Title 32 - National Defense
(a) Upon assuming command, commanders shall so advise appropriate superiors, and the units of their commands. (b) When appropriate, commanders shall also advise the following officers and officials located within the area encompassed by the command concerning their assumption of command. (1) Senior commanders of other United States armed services; (2) Officials of other federal agencies; and (3) Officials of foreign governments.
Title 32: National Defense
PART 700—UNITED STATES NAVY REGULATIONS AND OFFICIAL RECORDS
Subpart G—Commanders In Chief and Other Commanders
Titles and Duties of Commanders
§ 700.703 To announce assumption of command.

