Another one of the fine librarians here at radref was kind enough to provide us with some additional information to help answer this question. He suggested checking out Global Security for an article on Iraq and the Asian theatre of operations. There is an independent research consortium's website dedicated to the War in Iraq, Conflict in Iraq, where more information can be found. There's also a great resource on FedStats which provides information on troops by region. There's also some information linked within Radical Reference itself, which leads to a link to the ALA's International Responsibilities Task Force. I hope these additional resources are helpful.