All the sounds were added later....and they could have done a better job on that issue. Gun cameras of the era were just that....cameras w/o sound.
Harry Rupelt flew in B-17's and later B-24's as a true Norden bombsight bombardier, then togglier, dropping on the signal when the lead plane dropped his load. Rest his soul, Harry hardly ever, as most WWII vets, talked about his 24 mission accomplishment over Europe, but when he did we were all ears.
He said that the planes took a tremendous beating from damn close flak that left small, medium and large holes everywhere...and these were the ones that made it back to home base! Many of the planes that did make it home had hundreds of holes of all sizes that grounded some for weeks as they got patched up. They looked odd close up with zippers of patched up metal and round discs slapped onto smaller holes. Many were so bad they hit the on-base scrapyard where, like a auto junkyard, they were slowly stripped of all good parts for other planes. Then the Brits broke them up, melted the mostly aluminum parts at Spitfire and Lancaster bomber manufacturing sites and made new Brit planes. Talk about recycling!
