Air Force Chief of Staff Gen. Mark A. Welsh III poses for a portrait, June 24, 2016, in his office in Washington, D.C. As the CSAF, he serves as the senior uniformed Air Force officer responsible for the organization, training and equipping of 660,000 active-duty, Guard, Reserve and civilian forces, both in the US and overseas. As a member of the Joint Chiefs of Staff, the general and other service chiefs function as military advisers to the secretary of defense, National Security Council and the president. [Photo/IC]