 The commander of the vehicle also has the ability to override the command to take control of the turret and gun from the gunner.Although not much is known about the composition of the K21's armour, the frontal armour of the vehicle is specifically designed to protect against large caliber automatic cannon rounds, primarily the 30 mm APDS munitions (30×165mm) for 2A72 automatic cannon used on BMP-3, which has approximately armour penetration at ranges of 1,000 m. The side armour is designed to protect against 14.5 mm AP rounds, which has approximately armour penetration at 1,000 m. The top can withstand fragments from 152 mm artillery shells exploding as close as 10 meters.It has been confirmed that the composite armour comprises S2-glass fibre and Al2O3 ceramic including lightweight aluminium alloy.