LOS ANGELES (TheWrap.com) - Here's a celebrity who's walking the walk this Memorial Day weekend: country star Tim McGraw is launching HomeFront, a national program that will award mortgage-free homes to wounded military vets in the 25 cities on McGraw's summer tour. Partnering with Chase and Operation Homefront, McGraw will give away one house to a military family in need in each of the stops on his tour, beginning with Tampa on June 2. ...