U.S. Air Force Staff Sgt. Devin Tiger, a 386th Expeditionary Security Forces Squadron military working dog handler, leads Nido, MWD, through an agility course at an undisclosed location in Southwest Asia, May 21, 2015. Memorial Day is observed on the last Monday in May as a day of remembrance in honor of the men and women who died in the pursuit of freedom and peace. (U.S. Air Force photo by Senior Airman Racheal E. Watson/Released)