Firefighters and military personnel unfurl the American flag from the roof of the Pentagon, 12 September 2001. 184 people—70 civilians and 55 servicemembers in the Pentagon, 59 people aboard the aircraft—were killed the previous day when American Airlines Flight 77 crashed into the building. Take a moment today, the 13th anniversary of that terrible event, to remember all who lost their lives and whose lives were changed forever.