Those headquarters, commands, and agencies involved in the training, preparation, mobilization, deployment, employment, support, sustainment, redeployment, and demobilization of military forces assigned or committed to a joint operation. It consists of the Joint Staff, the Services and their major commands (including the Service wholesale logistics commands), the combatant commands (and their Service component commands), the subordinate unified commands and other subordinate joint forces of the combatant commands, and the combat support agencies.