Owen Gleiberman Chief Film CriticTom Hanks shows what a commanding actor he can be from the first taut combat sequence of “Greyhound,” when the title warship, leading a convoy through the North Atlantic in the early months of World War II, spies a U-boat speeding toward it from a dozen miles away. As the German sub approaches, we hear a lot of rapid-fire military and navigational jargon shooting back and forth between the sailors (“Hydrophone effects slow rev, sounds like 60 RPM, sir!”).