In the late 1960s "Chicago" and "Albany" underwent major engineering overhauls under SCB 002 and both the missile systems (Talos and Tartar) had new digital fire control system upgrades to handle the increasing threat from Soviet Navy anti-ship cruise missiles and aircraft, although "Chicago" did not receive all of the changes that "Albany" received. "Columbus" did not receive these missile system upgrades due to lack of funding. The Talos system was deactivated on the "Albany" class (leaving them with the Tartar as the only SAM system operational) and all other ships in the fleet that carried it during 1976.