국방과학연구소
The K9 Thunder is a South Korean self-propelled 155 mm howitzer designed and developed by the Agency for Defense Development and Samsung Aerospace Industries for the Republic of Korea Armed Forces, and is now manufactured by Hanwha Defense. K9 howitzers operate in groups with the K10 automatic ammunition resupply vehicle variant. The entire K9 fleet operated by the ROK Armed Forces is now undergoing upgrades to K9A1 standard, and a further development of a K9A2 variant is in process.