Rotem (part of the Hyundai group) has developed the K1 series of vehicles, which includes the K1A1 120mm main battle tank, the K1105 mm main battle tank, K1 ARV armoured recovery vehicle, and the K1 AVLB armoured vehicle launch bridge. The vehicles are built at Rotem's automated production facility at ChangWon.The first two prototypes of the K1A1 successfully completed operational tests in 1997 and the tank is in production and in service with Republic of Korea Army. Total requirement is for about 300 K1A1 tanks, scheduled to be in service by 2010.Rotem is developing the successor to the K1A1, the K2 Panther, which is armed with a 120mm/L/55 smoothbore gun with automatic loader and has uprated engine and improved armour. Three pre-production tanks have been completed. It is planned that about 680 K2 tanks will be produced from 2011.