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A World War II battalion headquarters in combat is difficult to describe because they varied so much. Typically, the actual headquarters was where the commanding colonel set up his command post (CP). He might use a tent about twelve feet square or a log-covered bunker. Headquarters personnel might consist of the battalion commander (usually a lieutenant colonel), his executive officer (a major), and captains for administration (S-l), adjutant in charge of operations (S-3), and supply (S-4), with a first lieutenant for intelligence (S-2).
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George Wilson (If You Survive: From Normandy to the Battle of the Bulge to the End of World War II, One American Officer's Riveting True Story)