New Red Alert 3 Unit - The Mecha Tengu

Obviously inspired the likes of Robotech, Transformers and other mecha anime, the Empire of the Rising Sun in Red Alert 3 will have transformable jet fighters called Tengu (named after the mythical Japanese creature). Apparently the unit is very versatile since it's considered a land and air unit (depending on which mode it's in). The only question I have is what on Earth are the arms for? In Robotech at least the arms/hands were used to hold rifles - but not so with this unit, so they're merely decoration :S.