Patriot Day
U.S. Air Force Staff Sgt. Talisa Williams, 455th Expeditionary Force Support Squadron, lowers a U.S. flag during a retreat ceremony at Bagram Airfield, Afghanistan Sept. 11, 2014. Airmen participated in a Patriot's Day Retreat and reenlistment ceremony Sept. 11, 2014. Patriot Day is an annual observance to remember those who were injured or died during the attacks on Sept. 11, 2001. (U.S. Air Force photo by Staff Sgt. Evelyn Chavez/Released)