ok... who switched my B-17's armour for papier maché?

[birdsofmay]

i've seen a few b-17 bombers and I am amazed by the feats the plane reached but I can almost make a hole in the plating with 1 punch

yes I pressed on the plating in a musem (yes I know I shouldn't) and a dent apeared its 3mm thick at the most so bullets enter at 1 side and leave at the other side. So the armor isnt that good it just has 12 turrets well 12 guns