The site, www.pentagon-ai.army.mil was hacked to carry pictures of a UFO and much hacker rhetoric sometime on Saturday US-time.

A few hours later the site "disappeared", probably taken off-line by operators while they tried to fix the problem and patch the security hole that allowed the hack to be made in the first instance.

This is not the first time US military Web sites have been hacked and such events are obviously a huge embarrassment to those responsible for the security of such systems.

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