General Mark A. Welsh III is Chief of Staff of the U.S. Air Force. As Chief, he serves as the senior uniformed Air Force officer responsible for the organization, training, and equipping of 690,000 Active-duty, Guard, Reserve, and civilian forces serving in the United States and overseas. As members of the Joint Chiefs of Staff, General Welsh and the other Service chiefs function as military advisors to the Secretary of Defense, National Security Council, and the President.