Activision announced today that Brian Johnson, lead singer of AC/DC, along with Dennis Haysbert from the hit television series 24, will both contribute their voice talents to WWII FPS Call of Duty: Finest Hour. Veteran writer and producer Michael Schiffer (Crimson Tide, Lean on Me) will handle the first-person WWII shooter"s script, while award-winning composer Michael Giacchino (Alias, The Incredibles) is writing the score.