The calling will be fixed.

As for the weapons of the Support Class and Heavy Weapons class... Maybe the names are throwing you off but our Support class is more a defensive support guy. He goes around repairing , rearming and setting up defence.

He has trip mines , not frag nades.

The Heavy Weapons is setup more for taking out vehicles. 1st he has his heavy rifle or launcher etc , then he has his emp nades , mines and a portable shield generator.

The classes are setup much like a spectrum. You have your far left Anti Infantry - normal trooper (with a sniper rifle he is completely anti infantry)  and on the far right you have your Heavy Weapons dude who is the best vs vehicles ( he becomes totally anti vehicle when he chooses he rocket launcher)

Inbetween that you have your medic , situated moderate left ..with his anti infantry area affect nades and frontline trooper support equipment such as bacta and a defibrillator .   Moderate right you have your Support dude who can harm vehicles with his detpack and trip mines , to some extent ( not as much as Heavy Weapons ) plus his support such as repair, rearm and anti infantry trip mines.

Dunno if that made much sense .. i am past tired .