M2A1 Slammer is a copy Merkava Mark IV.

ProGamer is right, missing one crew member because, loader semi-automatically selects the ammunition type. This tank has four crew members.

Also missing shells like APAM ( only M2A1 Slammer has ammo HE) Slammer which is a version M2A4 "UP" dosen't have them. This should have a 120mm gun instead of 105mm like a Merkava 1 and 2.