What joint force that is constituted and so designated by the Secretary of Defense a combatant commander a subordinate unified commander or an existing Joint Task Force commander?

A joint force that is constituted and designated by the Secretary of Defense is referred to as a "Joint Task Force" (JTF). This command structure is established to accomplish a specific mission, typically of limited duration, and can be led by a combatant commander or a subordinate unified commander. The JTF is designed to integrate and coordinate the efforts of multiple service branches and agencies to achieve operational objectives effectively.