US President Barack Obama shakes hands with retired US Army Lt. Colonel Charles Kettles after presenting him with the Medal of Homor during a ceremony in the East Room of the White House on July 18, 2016 in Washington, DC. Lt. Colonel Kettles was awarded the Medal of Honor for conspicuous gallantry while serving in Vietnam. / AFP PHOTO / MANDEL NGANMANDEL NGAN/AFP/Getty Images