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U.S. Air Force Staff Sgt. Trey Nelson, a 30th Security Forces Squadron military dog trainer, second from right, sits with military working dog Axel during the annual Fritzlar International K9 seminar at Fritzlar German Army Base, Germany, July 11, 2023. Axel retired from service as a military working dog, July 25, 2025, from the 52nd Security Forces Squadron, at Spangdahlem Air Base, Germany, and was adopted by Nelson, who was his seventh handler. While in service, Axel participated in 18 U.S. Secret Service missions in partnership with his eight handlers. (Courtesy photo)