They sacrifice themselves like samurai, these Americans. A critical part of WWII gets the big epic cinematic treatment, with all star casting and lots of noise. Though purporting to be exactly how things were during this particular battle, a pinch of salt is also needed. Much of the film is taken up with laying foundations for the air-sea engagement of the title, political posturing and military machinations are joined by needless sub-plots. The dialogue is often cheese laden, some characterisations equally so, while the splicing of real life footage and other war movie moments start to…