Ive never seen action (I was a computer guy when in the Army), I have known a few service members who talk about how they get flashbacks on the 4th (and here in Utah on the 24th). A few of them including my father (Vietnam) have mentioned how they cant watch some of the war movies now days because they are so real, they mention Lone Survivor as an example and of course Saving Private Ryan, and few also cant play games like Batle Field 3-4 because the sounds are so real they say.
The 4th here in Utah ahs become crazy the last few years, they passed a law allowing aerial fireworks a few years ago, I was driving home from a meeting last night about 9:45 and I could see the whole valley and it was like a big fireworks show (I was on the east side of 215 for those from here), It was crazy how many random bursts there were, there wasnt a time when I didnt see at least 4 in the sky at once it was crazy.
With that being said, I was in Valencia Spain 4 years ago for what they call Fallas and let me tell you, the sounds at night, I thought I was ina war zone! I mean banging loud noises it shook my apartment!