“Service members have relied on canine comrades since the beginning of organized warfare, but it wasn’t until March 13, 1942, when the United States Army began training dogs for the newly established War Dog Program, or “K-9 Corps” that they became a critical part of the armed forces.”
https://americanhumane.org/press-release/national-k9-veterans-day-on-march-13-honors-americas-military-dogs/
