The Treyarch executive producer Dan Suarez said in an interview that this year's campaign of Call of Duty: Black Ops can not be played in cooperative and can be addressed only in single while you can still use two accounts for to play via split-screen both on the training field and multiplayer. However, it remains to reveal the co-op mode similar to that found in Modern Warfare 2, the latest statements which date back to early this month by Josh Olin, the game developer community and menagerie. We look forward to information.