Tactical droids were a type of battle droid designed to plan battle strategies. Baktoid Combat Automata manufactured several models of tactical droid, including the T-series military strategic analysis and tactics droid and the more advanced ST-series military strategic analysis and tactics droid, including General Kalani. Later, L-1 tactical droids would be used during the Galactic Civil War.
50R-T was a tactical droid from the Old Republic-era.
After the collapse of the CIS, the droid army was shut down and sent to decommissioning facilities, like one on Corellia. However, the droids' intelligence on clone tactics become highly valuable as many parties were interested in countering the Imperial Military, which still primarily consisted of clones.