[Mobhack]

The M9A1 bazooka penetration was 5 inches - the OOB figure is 12cm. The tiger tank front armour in the OOB is 12, so the basic bazooka round can penetrate, since pen is greater than or equal to armour.(Warhead size, or critical hits, can occasionally increase pen, but as it is a HEAT round, it can have reduced pen or even a fuse failure).

It is impossible to say why you are having problems with your infantry, without any information as to what you are doing, or what status the enemy is in - for example if the USA in your example is dug in and defending, then hitting size 0 bazooka teams will be difficult. And, if you are trying the common beginners mistake of attempting moving your infantry over 1 hex while under fire, then they will suffer, or moving any troops (tanks don't have stabilisers in WW2) over a hex or so, and then expecting good shooting results. See the "Game Play Notes" section of the Game Guide for tactical hints.

Cheers
Andy