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FM 3-0

7-141. Commanders designate a portion of the main body for use as the reserve. The size of the reserve is based on the mission variables and the amount of uncertainty concerning the enemy. The more vague the enemy situation, the larger the reserve. The reserve in a movement to contact typically constitutes approximately one-fourth to one-third of the force. On contact with the enemy, the reserve provides flexibility to react to unforeseen circumstances and allows the unit to quickly resume its movement.
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