My father was in the Navy at the time but was lucky enough to be getting a college education (paid for by the Navy), heading toward an officer's position. Dad was no privileged rich kid. His father worked at a local road department. But good genes made him smart and he passed with a high score on the Navy's entrance exam. Otherwise he may have also been storming the beaches (and I might not be typing this).
Beyond that, I've gotten the best/worst impression of D Day while watching the beginning of "Saving Private Ryan". I'm certain that even a very well done film can't do justice to actually being there. Surviving 6/6/44 took more luck (I think) than skill. But skill should never be discounted.
Finally -
Thinking about this topic earlier today, I thought about how many friends I never met or had because the men who would been their fathers never made it back from D Day/WWII. How different so many peoples' lives would have been.
