Battle Droid

Battle Droids  or B1 Battle Droids were droids used by the Separatists in the Clone Wars era. Later in The Last of the Droids, Battle Droids reappeared to defeat the Empire. Battle Droids still weren't smart during The Last of the Droids, so commanders and generals got fed up with them. Battle Droids usually carried E-5 blaster rifles but others carried rocket launchers in some cases.

Variants
Battle Droids had different variants.
 * Commander Battle Droids: Battle Droids with yellow marks that commands the army of droids or commands a destroyer.
 * Security Battle Droids: Battle Droids with red markings that secure the area and drive CIS Landing Crafts.
 * Pilot Droids: Battle Droids with blue marks and they piloted AATs and command ships.
 * Green AAT Commanders: Battle Droids with green marks that commands AATs.
 * Driver Battle Droids: Battle Droids that drive the ships such as Providence-class carriers but are still regular Battle Droids.