That portion of a force withheld from action at the beginning of an engagement so as to be available for commitment at a decisive moment. An operation in which a unit is replaced in combat by another obit. Responsibilities for the combat mission and the assigned sector or zone of action of the replaced unit are assumed by incoming unit. (AFPM 3-8-1, PAM 3-041, PAM 3-071,S-2008)

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