Matt Damon stars in this Iraq war thriller loosely based on the book Imperial Life in the Emerald City by Washington Post journalist Rajiv Chandrasekaran. With Greg Kinnear and Brendan Gleeson.   Matt Damon stars as Chief Army Warrant Officer Roy Miller, a specialist soldier who joins forces with Wall Street reporter Lawrie Dayne to expose the hotbed of covert and faulty intelligence surrounding the search for Iraq\'s cache of weapons of mass destruction. Greg Kinnear and Brendan Gleeson co-star.