The UNSC Army is the largest branch in the UNSC Defense Force and is the primary response for all land-based military operations. The UNSC Army serves as the main garrison force on the United Earth Government controlled colony worlds. In conjunction with the Navy and Air Force, the Army has the means to transportation and equipment needed to support ground combat and garrison duties. Some Spartans are known to work for the UNSC Army under Special Forces operations. These Special Forces work for the UNSC Army Special Warfare Command, otherwise known as SPECWARCOM. Some examples of these fighters are the Noble Team and other Spartan III special programs.

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