The Joint Staff is a group within the United States Department of Defense that assists the Chairman of the Joint Chiefs of Staff in coordinating military operations and strategy. It is composed of military officers from each branch of the armed forces, including the Army, Navy, Air Force, Marine Corps, and Coast Guard. The Joint Staff plays a crucial role in ensuring that all branches work together effectively. The primary function of the Joint Staff is to provide advice and support on military matters, including planning and executing operations. It also helps in developing policies and strategies that align with national security objectives. The Joint Staff collaborates with various entities, including the National Security Council and Department of Defense, to ensure a unified approach to defense and military readiness.