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The UNSC Marine Chaplain's Corps consists of ordained clergy who are commissioned Marine officers.
It is likely that the Chaplain's Corps draws its existence from past earth militaries, most notably the United States Military, which consisted of the Army Chaplain's Corps, Air Force Chaplain's Corps, and Navy Chaplain's Corps.
Their purpose is to offer religious services, counseling, and moral support to the armed forces, whether in peacetime or at war.
Chaplains are commissioned officers, and may be granted up to the rank of Lieutenant Colonel (O-5).