They were all destroyed during the Dalek's second war with the Cybermen, which they lost disastrously. Since then, they have secured thier place in Dalek history as the most pathetic bunch of failures to ever show their faces in public, with the majority of their troops being destroyed by even the weakest Cybermen, and Big Camp Leader Guy himself being bombed by a Cyb-uicide unit and issuing his last command: 'Get my Mummy!' before exploding in a ball of white hot fire.
Since then, the Dalek-Cybermen Alliance has ruled that no more Dalek Rangers should ever be created, to restore the purity and the supremecy of the Dalek race. Likewise, a price has been put on Emperor Wassabe's Head that prevents him from going anywhere near League space.