Whoops, I almost forgot. While the military will not admit to it openly like they do the kidnappings, every now and then home movies and photos let the undeniable the cat out of the bag.
http://query.nytimes.com/gst/abstract.html?res=FB0F16F63C540C728FDDAC0894DB4044 82
But since everyone does not have access to the NYT here is a free copy.
http://www.iht.com/articles/98104.html
If you need more just try using a search engine and typing in words like 'iraq us troops torture'. Its not like I have some magic power when it comes to keeping up with the news. Keeping up with the major news outlets around the world can do wonders for your understanding of the world and greatly differs from what our leaders, our government and their mouthpieces we call the major media have to say about it.
Just look at the first legitimate news story I get on the subject when I type that in.
http://www.guardian.co.uk/Iraq/Story/0,2763,1004821,00.html