Country diva Reba McEntire and Walter Cronkite join the Salvation Army in extending its message of hope through its Army of Stars annual Christmas radio program. Every year, for over 50 years, some of the world's finest musicians and entertainers from stage and screen have shared their talents through the special program. McEntire is tapped to host the "What If" segment of the program, where she'll be joined by Kathy Mattea and Emmylou Harris in telling the Christmas story through song. "What If" is a celebration of Christmas Nashville-style. The shows will be aired on more than 1,200 radio stations nationwide throughout the Christmas season.