People attend a ceremony commemorating the September 11, 2001 attacks at the Pentagon in Washington, DC, on September 11, 2016. / AFP / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
People attend a ceremony commemorating the September 11, 2001 attacks at the Pentagon in Washington, DC, on September 11, 2016. / AFP / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)