As to the story, I'm a bit skeptical of a story where they installed 1000 lbs of steel armor around the cockpit to avoid
"flack" cannon damage in a night dive bombing attack.  Or the part where bullets sounded like rain on a tin roof during the
attack.  It sounds like someone doing a little embellishing to his son in a war story.
     Btw, Japanese anti-aircraft was called ack-ack, the Germans used Flak...short for Flugabwehrkannone...among others.