Algodoo

The rockets have a careful balance of air friction for extended range and stabilization, can be re-used, and are concealable enough to fit in a backpack... and are easy-to-use enough to be mounted on the battlefield in clips of a variable number of rounds.(thats an important thing for terrorists, since they haven't a lot of training/budget)
credits to MaloK for the mechanism(well, its so old, what he might not remember).

Up and Down control artillery, F fires(automatic).