If the character is true the movie will fall into place. Or at least that's what you hope.
I have a friend that is a WWII buff and we sat and talked a lot about stuff...
If you've never felt that you quite got a hold of it you just feel that...
I travel 330 days a year and eat every two and a half hours - I'm a big guy. I always carry a fork little bottles of spices and Sriracha. I eat what I feel like eating.