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a. Article 575, Navy Regulations, 1920 states: “When serving on shore in cooperation with vessels of the Navy, brigade commanders or the officer commanding the detachment of marines shall be subject to the orders of the Commander in Chief, or, in his absence, to the orders of the senior officer in command of vessels specially detailed by the Commander in Chief on such combined operations so long as such senior officer is senior in rank to the officer commanding the brigade or the detachment of marines. When the brigade commander or the officer commanding the detachment is senior to the senior officer in command of the vessels specially detailed by the Commander in Chief on such combined operations, or when, in the opinion of the Commander in Chief, it is for any reason deemed inadvisable to intrust such combined command to the senior officer afloat, the Commander in Chief will constitute independent commands of the forces ashore and afloat, which forces will cooperate under the general orders of the Commander in Chief.”