Definitions for joint staff
Dictionary of Military and Associated Terms
1. The staff of a commander of a unified or specified command, subordinate unified command, joint task force, or subordinate functional component (when a functional component command will employ forces from more than one Military Department), that includes members from the several Services comprising the force. These members should be assigned in such a manner as to ensure that the commander understands the tactics, techniques, capabilities, needs, and limitations of the component parts of the force. Positions on the staff should be divided so that Service representation and influence generally reflect the Service composition of the force. 2. (capitalized as Joint Staff) The staff under the Chairman of the Joint Chiefs of Staff as provided for in Title 10, United States Code, Section 155. The Joint Staff assists the Chairman of the Joint Chiefs of Staff and, subject to the authority, direction, and control of the Chairman of the Joint Chiefs of Staff and the other members of the Joint Chiefs of Staff in carrying out their responsibilities. Also called JS. See also staff.