It is a really bad movie. The re is an overload of romantic and war movie clichés, and the acting is mediocre. The main character is trying so hard to be Forrest Gump, it's almost endearing. Agent Smith/Tick is the single exception, making a convincing drunkard.
The first half of the movie only has boy meets girl plus boy has father issues. That makes a loooong wait for combat footage, if that’s what you came for.
But especially don’t go if you are looking for a war movie. Yes, the latter half includes quite some imagery of war, and I'm sure weapons and equipment are historical and suitably dirty. But I don’t get the feeling it has any relation to warfare on
Okinawa in 1945.
It’s more allegorical of how horrible war can be. And how American heroes can look righteously into the camera. More care has been taken of aesthetics than of reconstructing reality (and of course a movie doesn't have to; but then again, I don't have to like it). But if you want to see operating bullet ejection mechanisms in close up, this is your movie.