Here's a list of IFV types when you enter infantry:

Crazy Ivan: Demolition IFV
Yuri: Psi-blast IFV
Flak trooper: Flak IFV
Tesla trooper: Tesla IFV
Conscript/GI: Machinegunner IFV
Dog: see Conscript/GI, but can detect spies
Tanya: Unknown
Chrono Legionarie: Chrono IFV
Sniper: Unknown
Terrorist: Kamikaze IFV
Desolator: Bio IFV

All others are similar to Conscript/GI.