Unified Ground Command

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The Unified Ground Command (shortened as UniCom) has control of all UNSC ground-based operations and is loosely modeled on the now-defunct United States Marine Corps. UniCom's roles include, but are not limited to, disaster relief, infantry operations, search and reconnaissance ops, and other "ground pounder" duties. Naval special warfare troops are an exception, and are instead controlled by NavCom.

Structure

The basic unit of the ground force operation is the squad, consisting of twelve soldiers, or thereabouts. Ground forces are further grouped into platoons, companies, battalions, regiments, and divisions. The force numbers given in the descriptions below are ideals, rarely matched exactly in the field. At the higher levels, these numbers include a significant amount of support personnel such as logistics and administration.

Squad

A squad contains usually twelve soldiers, led by a Corporal or Lance Corporal.

Platoon

A platoon normally contains three squads (thirty-six men) led by a Second Lieutenant, with a "Platoon Sergeant"; usually a Sergeant or Staff Sergeant.

Company

A company contains four platoons, plus a group of personnel assigned as "Company Headquarters Section" (164 men in total), commanded by a First Lieutenant or Captain, with a "Company Sergeant", usually a Staff Sergeant or a Gunnery Sergeant. The twelve companies of a regiment are named phonetically "A" (Alpha) through "M" (Mike) with the exclusion of "J". First battalion consists of companies A through D, second battalion is companies E through H, and so forth.

A typical infantry company would have three infantry platoons and one heavy weapons platoon, but these numbers are flexible depending on the unit type and mission. T companies, for example, eschew this model and mix their heavy weapons personnel into each platoon, so all the platoons have one heavy weapon squad.