Who is not part of the joint chiefs of staff?

The Joint Chiefs of Staff (JCS) primarily consists of the highest-ranking military officers from each branch of the U.S. Armed Forces, including the Army, Navy, Air Force, Marine Corps, and Coast Guard, along with the Chairman and Vice Chairman of the Joint Chiefs of Staff. However, civilian leaders, such as the Secretary of Defense and the President, are not part of the JCS. Additionally, members of the National Guard and Reserve components do not typically hold positions within the JCS.