Not every servicemember in Iraq is someone you'd be happy to meet in a dark alley. Much less do they uniformly represent the ideals we'd like to propogate abroad.
Take James Douglas Ross, for example. He was separated from the Army when he was caught trying to mail a submachine gun from Iraq to his father's home in Spokane. Then the Military Police find a cache of white supremacist paraphernalia, alongside several weapons, hidden behind ceiling tiles in Ross's military quarters. Then, after he's discharged, Ross starts passing out flyers from the National Alliance, which is a neo-Nazi organization that hates minorities and Jews and that advocates the violent overthrow of the U.S. government.
I'll spare you the remainder. Suffice it to say that he's not a nice guy.