You actuelly get an option? They'r probably the weakest unit in existence (up until now) with only 110 hp and no armor.
Might aswell bash ' em and save you the money.
"The flower of friendship blooms even in hell. On the sand where waves come and go, it leaves its petal as a memento. We will make it bloom again someday, The Okama Way!" - Mister 2, Bon Clay