Well, let's just look at what the article says:
Fellow soldiers testified that the four Pennsylvania reservists punched and kicked prisoners who were being brought to an American camp in southern Iraq on May 12.
Now -- if you want to call her fellow soldiers "filthy Iraqi terrorists," you're free to do so. It would be more reasonable, however, if you simply read the article before posting stupid opinions.
The way it works in the military these days is that anyone connected with an event that generates a complaint will be forced to sign a sworn statement regarding what they saw. The Iraqis could have filed the complaint, or an officer who was worried about his career could have done so. The soldier's testimony is simply that they witnessed or had knowledge of the event.
If a soldier saw another punch or kick a prisoner, they have to state that they did, regardess of whether or not it was self defense. I've had to testify about an event that I witnessed, even though I didn't initiate the complaint, and there was no actual wrongdoing. The military is simply trying to cover it's ass, which is SOP when there is any possibility of negative publicity.