U.S. Air Force Tech. Sgt. Joe Gamble, foreground, a professional military education instructor with the 374th Force Support Squadron Airman Leadership School, salutes as a U.S. flag is lowered during a retreat ceremony at Yokota Air Base, Japan, Sept. 26, 2013.
Retreat was performed to signal the end of the official duty day and pay respect to the flag. (DoD photo by Yasuo Osakabe, U.S. Air Force/Released). Original public domain image from Flickr