I'm currently watching a subtitled anime series called Zipang.
Now, I just had an interest in the movie The Final Countdown, which has a 1980's aircraft carrier go back to pearl harbor. The moral imperatives there are fairly simple: To help or not?
Zipang takes it quite a bit further. It has a modern Japanese ship, looks to be a destroyer/cruiser, goes back to the battle of midway. Combat abilities are stated to be able to compete with the entire american fleet there.
Think about hard the decisions would be in this one? Would you support your own country, when it's engaging in acts of agression against a country, that in your time, is a close ally? When you know it's conducting an imperialistic crusade that's seen as improper for today?
The closest I can think of, as an american, would be the various wars against the Native Americans. Some of the actions in other foreign areas, that don't often get taught in public school.