Japanese weapons seem a little strange in this game. The Tokyo Arsenal SMG has a front grip, but the soldier holds onto the magazine anyways. The type 99 LMG has a bayonet on it too, which I find funny
As someone who has maxed out every Axis squad, I’d recommend the radio squad. Generally, flamethrower squads are best for retaking a losing objective or preventing/defending an objective. Radio squads can do both, and may be better due to flamethrowers being nerfed a lot.