Tank commander
The commander of the tank – directs the actions of the tank crew during combat operations, training and combat activities, and maintenance. The tank commander must know his combat vehicle well, its tactical and technical characteristics, and be able to perform the duties of a mechanic-driver and gunner. The commander is responsible for the tank's technical condition, operation, combat use, and armament [ArmyInform].
Tank Commanders must coordinate so the crew can effectively communicate, move, and shoot. The Tank Commander takes orders directly from either a Platoon Leader or a Platoon Sergeant, depending on how the armored platoon is structured, which varies with the type of vehicle and branch of the military. They coordinate the other crew members' decisions and implement orders from their commanding officers.
Like most military positions, tank commanders have to rise through the ranks. They typically spend the preceding years aboard a tank, working the various other positions or becoming familiar with them. Aside from the Commander, each position is considered equally important to one another, and the hierarchy inside a tank relies completely upon a soldier's rank [Shmoop].
Military profession - tank driver. ArmyInform. Retrieved from: https://armyinform.com.ua/2021/09/28/vijskova-profesiya-tankist/
Tank Commander Career. Shmoop. Retrieved from: https://www.shmoop.com/careers/tank-commander/