2018 Defenders of Liberty mud run: Getting down and dirty Published April 11, 2018 By Senior Airman Stuart Bright 2nd Bomb Wing Public Affairs BARKSDALE AIR FORCE BASE, La. -- Participants of the 2018 Defenders of Liberty mud run race across the starting line at Barksdale Air Force Base, La., April 7, 2018. There were 481 runners that participated in the mud run this year. (U.S. Air Force photo by Senior Airman Stuart Bright)