National K9 Veterans Day, March 13, is a day set aside to honor commemorate the service and sacrifices of American military and working dogs throughout history.

It was on March 13, 1942, that the Army began training for its new War Dog Program, also known as the “K-9 Corps,” according to American Humane, marking the first time that dogs were officially a part of the U.S. Armed Forces.

Military Working Dogs are a vital part of today’s fighting force. With built-in radar, they can smell out trouble that no human or man-made device can.

Today’s military dogs are valued as important members of their military units and even have their own retirement ceremonies, awards and medals, and memorial services.