“The Greatest Beer Run Ever” (*** out of four) was a winning comedy drama based on a true story set in 1967 in which a blue-collar NYC guy (Zac Efron) became tired of going nowhere in his life and decided to make a difference in the Vietnam war by bringing beer to his serving friends and a multitude of other troops and became enveloped and involved in the war himself. Efron has never been more charismatic and engaging and the Farrelly Brothers offer pertinent period detail and give solid supporting roles to an unrecognizable Bill Murray as a neighborhood bartender, Russell Crowe as a war journalist, and others. Film sags a little once Efron does actually make it to Vietnam but regains its footing for a heartfelt conclusion.