Militia Commander

The Militia Commander is a supporting antagonist in Batman: Arkham Knight. He is never seen, but he controls the drones when Batman is battling them and is a back-up commander in case both the Arkham Knight and Deathstroke were defeated.

Before Arkham Knight
Scarecrow hired the unnamed individual as a back-up commander in the event both the Arkham Knight and Deathstroke were beaten.

Arkham Knight Incident
After the disappearance of the Arkham Knight and the incarceration of Deathstroke, the unnamed commander oversaw his campaign against Mr. Freeze.

Trivia

 * The character taking over the Militia could be non-canon but was made in case Campaign for Disarmament is finished first; however, he is the voice during all tank battles regardless of whether the Arkham Knight and Deathstroke are defeated.
 * The commander is actually a sergeant or higher-ranking noncommissioned officer.
 * Despite never being seen in the main game, he has his own death screens in In from the Cold.