Rapier,

Actually, what determines the difference between a rocket and a missile is that a rocket is completely unguided in flight. The pilot may aim the rocket, but from the point he pulls the trigger it is completely out of anyone’s or anything’s control. Rockets do not have movable flight surfaces nor do they have onboard computers, except maybe in the fuze depending on how sophisticated the fuzing system is. If a rocket ever develops the ability to change direction in-flight whether by pilot control or an onboard computer it ceases to be a rocket and becomes a missile.

Jake