 In 2014, CMI Defence and Doosan DST publicly revealed the K21-105, a light tank version of the K21 chassis fitted with a CMI Defence CT-CV 105HP turret.Referred to as a medium tank by its developers, the vehicle weighs around 25 tons with a 3-man crew, and is cheaper to produce and maintain and has better mobility than actual tanks.The vehicle's main role is direct fire support for infantry against armored and soft-skinned vehicles, buildings, and fortifications.