This is only for blitzkrieg and not normandy.
m18 hellcat - when turret is facing rear (in target arc mode) and if open up key is used,back of commander is exposed through tank.
m3a1 HT 2xmg- when facing back of half track gunners, back sticks through the armor in front
m5a1 late - when turret facing rear, commander sticks through armor right side of him and his back
m20 - commanders feet are sticking right through bottom of car. when engaging target behind vehicle