The Department of Defense has banned troop access to MySpace, YouTube and eleven other popular websites, including Photobucket and Pandora Radio. Their reason? The DOD doesn't have enough bandwidth to meet demand, though at least one message (pdf) to troops suggests that security concerns were also part of the decision. The DOD has also been working to crack down on troop blog posts and e-mail that hasn't been approved by a commanding officer first, notes Wired News (see the new blogging rules pdf).