Artbrooks, which civilians commuted Calley's sentence? This shows how much interaction takes place between politicians and the military. The idea that the military is uninfluenced by civilian political pressure is absurd. Calley certainly should have done the equivalent time that any murderer does.
BTW Teribus, there is some evidence that Bush did not finish out his tenure. There were statements by the commanding officer at Ellington. But there is no evidence that he did. Much of the evidence was destroyed apparently.
However there is no evidence at all to support the incubator atrocities.
Regarding the above letter, having reread it, I believe that it is a carefully crafted piece of propaganda. Part of it makes me question it's veracity. "Hillary Clinton is coming here tomorrow. For her sake I hope I don't see her. I might do something crazy like spit in her direction." For someone who is on the front lines to insult a US senator makes me question the motive for their being in Iraq in the first place. They certainly are not engaged in defending American's freedom of expression.