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In page Kabal:

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The walls usually form a circle that has one or two entrances guarded by soldiers with other soldiers on guard duty around the perimeter or in guard towers. Establishing kabals is manpower- and supply-intensive, requiring many convoys of Class IV (construction and barrier materiel) and contracted items. Combat Regeneration and Reorganization [CR2] is the redeployment of equipment, vehicles and soldiers from the Kabal.