Members of the U.S. Air Force 633rd Security Forces Squadron military working dog detachment and U.S. Army 3rd MWD Detachment participate in a ruck march in honor of National K9 Veterans Day at Joint Base Langley-Eustis, Virginia, March 13, 2020. After the eight-mile ruck march, the defenders did 13 push-ups in reference to the day and an extra push-up for each MWD their teams have lost. (U.S. Air Force photo by Staff Sgt. Kaylee Dubois)