Git-R-Done! That simple saying evokes one of two reactions in most of the American public: a violent, disgusted shudder or amused glee. I’m in the gleeful category, which is why I was amused to hear everyman comedian Larry the Cable Guy has taken his new TV show, “Only in America with Larry the Cable Guy,” on the road to feature Marines at Camp Pendleton, Calif. The History Channel will air the show Tuesday, April 12, at  9 p.m., according to the Facebook page for the Marine Corps Motion Picture and Television Liaison Office. The show’s website doesn’t say much about it right…