Article Photos: Obama leads mourning for Americans killed in Libya



President Barack Obama salutes as he steps off of Air Force One, Thursday, Sept. 13, 2012, at Andrews Air Force Base, Md. (AP Photo/Carolyn Kaster)

President Barack Obama salutes as he steps off of Air Force One, Thursday, Sept. 13, 2012, at Andrews Air Force Base, Md. (AP Photo/Carolyn Kaster)