U.S. Air Force fire department and security forces

U.S. Air Force fire department and security forces members participate in an evening memorial walk at Al Udeid Air Base, Qatar, Sept. 11, 2017. Traditionally, on the anniversary of the terrorist attacks, firefighters climb 343 stairs in honor of the fire and emergency services members that lost their lives on Sept. 11, 2001. Firefighters and security forces here at Al Udeid Air Base walked 3.43 miles to honor those who lost their lives on Sept. 11, 2001. (U.S. Air National Guard photo by Tech. Sgt. Bradly A. Schneider/Released)