U.S. Code » Title 10 » Subtitle Subtitle A— General Military Law › Part PART II— PERSONNEL › Chapter CHAPTER 43— RANK AND COMMAND

10 U.S.C. § 747

Command: when different commands of Army, Navy, Air Force, Marine Corps, Space Force, and Coast Guard join

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When different commands of the Army, Navy, Air Force, Marine Corps, Space Force, and Coast Guard join or serve together, the officer highest in rank in the Army, Navy, Air Force, Marine Corps, Space Force, or Coast Guard on duty there, who is otherwise eligible to command, commands all those forces unless otherwise directed by the President.