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" The United States military officially began using canines in World War I and by World War II more than four hundred scout dogs were taking part in combat patrols, finding and hunting the enemy. After Pearl Harbor, a group of dog breeders formed “Dogs for Defense,” with the goal of building a well-trained canine force in the event America went to war. Come Korea, roughly 1,500 canines performed guard duty with the Army while others joined patrols. During Vietnam, with its close-quarters combat in treacherous terrain and tropical climes, dogs were once again called into action: around four thousand joined patrols to hunt for weapons and enemies, and served duty on army bases, especially at night when soldiers were most vulnerable to attack. But many of the dogs that served alongside U.S. soldiers never made it home; some were euthanized and others abandoned in "
― Gayle Tzemach Lemmon , Ashley's War: The Untold Story of a Team of Women Soldiers on the Special Ops Battlefield