The FS mortar is an antipersonell weapon, isn't it? It's way too inaccurate to target AT-STs anyhow.
That would be why there is the rocket launcher
And the explosive charges and EMP carried by the Support player, and the mines and EMP grenades carried by the HWS.
"One of the bitches actually gave birth while she was attacking, and her puppies joined in on the carnage."
--the awesomeness that is Boatmurdered.