From the BBC:
The US military is to block troops from using YouTube and MySpace and 11 other popular websites for sharing photos, video clips and messages.
The decision could stop thousands of soldiers from communicating with friends and loved ones.
For many US soldiers serving overseas YouTube and other similar websites are a popular way of keeping in touch.
But according to US reports, the Pentagon has decided to block access to such sites for technical reasons.
It says accessing and sending video across the internet takes up a lot of bandwidth and slows down the military’s computer system.
And not surprisingly perhaps, there are also security concerns.
The cyberspace battle space was not one that we were particularly operating well in
Lt Col Christopher Garver, US Army
US takes Iraq war to YouTube
There is a certain irony to the Pentagon’s reported decision.
It only recently started posting its own videos on YouTube showing soldiers in action in Iraq in a move designed to reach out to a younger audience and to show the successes of the US military.
See also here.