The bullfrog is an anti-air unit that is also a troop carrier. The conscript is an anti-infantry unit, it is also one of the weakest anti-infantry units in the game. The flak troopers will be able to deal with tanks and also take care of air units.
Natasha can one-shot an enemy and any unit in line with that unit also dies (a line shot). You will have control of four units in this simple mission.