Tim Walz defended his military service during his first solo speech as Kamala Harris’ vice presidential running mate, rejecting criticism from Republicans who accuse him of lying and using imprecise language to describe his military career. “These guys are even attacking me for my record of service. And I just want to say, I’m proud to have served my country and I always will be,” Walz said at a convention of the AFSCME union. “I’m going to say it again as clearly as I can: I am damn proud of my service to this country.” Walz said he signed up for the Army National Guard just two days after hi…