Rifles are beasts + their nades have sth like ~80% wipe chance.
I understand that US is supposed to have the upper-hand early game but because of rifles superiority this is just ridiculous - MGs are useless and when rifles go against grens it looks like navy seals murdering little, innocent ponies that never fired a rifle before.
That's a very interesting unit - but it definitely could use some love.
Using them is a high-risk/high-reward action while relying just on grens is much safer.