Critics are already calling Clint Eastwood's new movie, Flags of Our Fathers, the most important film of the year. It's a Second World War epic about the six soldiers who raised the US flag on the island of Iwo Jima, the six who live on through the now famous photograph that has become the most abiding image of the fight in the Pacific. As made by one of Hollywood's best-known Republicans, you might expect a stirring slice of patriotism, yet this is anything but an ode to America.