Let me explain. The term SRB (Solid (fuel) Rocket Booster) usually refers to a solid (fuel) rocket which is attached to something else in order to "boost" it.
But I just read this answer by @dotancohen about the Aries 1-X which seems to be a one-off test of an existing SRB from "Space Shuttle Inventory" used as a stand-alone rocket, in this case with a 2nd stage simulator. According to that article, a guidance system was assembled and used to vector the thrust of the SRB, with roll implemented via thrusters. So it got me thinking, is this really unusual for an SRB? In general are solid rocket boosters ever thrust vectored?
I guess a related question would be - are solid fuel rockets of this or similar size ever thrust vectored?
Now enjoy the video: