No, I was never in the service, but I have had lots of friends who were. 
I did work with a powder monkey on a road project through the Blue Ridge,and Henry could take that VW bus sized granodiorite boulder and crack it in half, shatter it into bits, or launch it across two lanes of pavement and a lane of deep fill, whatever you chose.
I only ever saw that man look scared once, when the boss was messing with a two part charge, ramping it with a shovel handle. His eyes got big, and I followed him over below the lip of the road surface and asked him , "I reckon what Carl is doing isn't recommended". He just looked at me and smiled (he didn't particularly like Carl) and shook his head. "Nope".
Heh. My guy was Norby. Same thing. Only time I seen him sweat, we was plumbing up a big shoot... about 150 feet by 12 foot shear, about 50 ft high... All the holes were drilled and packed, and we were doing caps and wire... Cocky as he is, we brought all the wire to the center and built the loom on the tailgate... He pulled the rip on the timer, and sauntered over to the truck, as I did too. Took our time getting in... laughed and poked a little fun about something or another...
It was his thing, to bet on the clock a bit... Anyhow, he reached for the key and...
click...
click...
click...
Sh*t...
click...
click...
Norby... We should git...
clickkk....
Nah... we can't outrun it now...
click...
VROOM....
Roll your windows down! kick the glass out..
He got us dang near out of the way of it, but we weren't going to make it, so he got as far as he thought he could, and turned her downslope for a sleigh ride to hell.
KERWOOOOM!
Woke up stacked against a big fir... Truck's totaled... we are bleeding out our nose and ears...
And he's laughing about it. Dumb sombich had a death wish, I swear.
Missed it by that much.