I'm no expert, but my guess is that towards the middle of the war, when the PzIV's were being upgunned and upggraded constantly, 5cm of armor was simply enough. At the ranges the PzIV was built to work at, 5cm would be able to handle most incoming rounds, and by the time Allied weaponry got more lethal, the "main battle tank" of the war was the Tiger, or the Panther, both of which could absorb a lot more punishment.
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Cold Waters Voice Crew - Fire Control Officer
Cmdr O. Myers - C/O USS Nautilus (SS-168)
114,000 tons sunk - 4 Spec Ops completed
V-boat Nutcase - Need supplies? Japanese garrison on a small island in the way? Just give us a call! D4C!
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