Airmen lower the flag before folding it during a Patriot Day, 9/11 remembrance ceremony at Buckley Air Force Base, Colo., Sept. 11, 2017. Patriot Day is an annual observance which takes place on September 11 and in an opportunity for people world-wide to take time from their day to remember the terrorist attacks that took place 16 years ago. Air Force photo by Airman 1st Class Holden S. Faul