President Barack Obama, second from right, exchanges greetings with U.S. Air Force Chief Master Sgt. Maurice Williams, center left, the command chief of the 145th Airlift Wing, North Carolina Air National Guard, upon arriving at the North Carolina Air National Guard base at Charlotte Douglas International Airport in Charlotte, N.C., Aug. 26, 2014. Obama visited Charlotte to deliver remarks during the 96th American Legion National Convention about issues affecting U.S. military veterans.