U.S. Air Force Senior Airmen Alexander O'Brien, 633rd Security Forces Squadron military working dog handler, and his dog Risa, 633rd SFS MWD, participate in a ruck march in honor of National K9 Veterans Day at Joint Base Langley-Eustis, Virginia, March 13, 2020. On March 13, military working dogs are celebrated for National K9 Veterans Day, which was the day the U.S. Army established the War Dog Program, or K-9 Corps in 1942. (U.S. Air Force photo by Staff Sgt. Kaylee Dubois)