In addition Republic of Korea manufactures the K-9 howitzer which have been exported to Turkey as the T-155 howitzer as well as the ZMA series TIFV's which saw action in UN peacekeeping operations (PKO) as part of the Malaysian peacekeeping forces. A variation of the K200, the KAFVs can be retrofitted to bear a 90 mm cannon, 40 mm grenade turret, M230-1 Chain gun Turret, or MK-30 Chaingun Turret. A replacement for K200 series IFVs are currently being tested, designated as K21 KNIFV (Korea Next generation Infantry Fighting Vehicle), which will have various capabilities for both land and naval warfare. The initial production is set for 2008, with the ROKA planning to field approximately 1,000 units until 2015.