Given the AA fire coming from a CV I am quite skeptical that the SBD's tailgun would make the difference.
I can't remember if it was
Carrier Admiral by J.J Clark or
The Big E by Edward P. Stafford, but one of these books told of deck crewmen manning rear guns during attacks.
If I recall correctly, at least one man was lost when the A/C he was in was blown overboard by a near miss. (I could be way off on that one as it's been a few years since I've read either.)
