I add...
Tank crews are supposed to work with perfect coordination. All tank crews has guys from the same nation, who can understand what is the other one saying.
FH2 already have crews of 2-3, Commander, MG Gunner and Top-Tower Gunner for some tanks, many people ignores the MG Front Gunner completly, its damn usefull. It sees what the tank doesnt see..
Especially the M13/40 Gunner position, you can waste all the rounds of MG Left Side and start using the MG Right Side, by far, it has the best MG system in all FH2 Tanks.