There doesn't seem to be anything in that article that suggests that the military perpetrated the attacks. Would you care to explain further?

EDIT: While a researcher with the US army was accused, there doesn't seem to be any evidence that he was actually responsible, and there is doubt over whether the anthrax he had access to was the parent of the spores used in the attack. Besides, even if he did it, saying that the US army is responsible for something implies high-level planning to do it. It's like saying, if someone in Anonymous works at McDonalds, and used a computer in one of their stores, that McDonalds is responsible for Anonymous's attacks.