The K311 is a 4x4 multipurpose 1 1/4–ton class cargo truck developed for the Republic of Korea Armed Forces, and was introduced in 1980. It is commonly known as 4-5 (5/4) ton (4-5 톤) or military Dodge (군용 닷지), because it replaced and had similar appearance with Dodge M37. It is a modernized version of the American Kaiser Jeep M715 truck, which was also designed with an intention to replace the M37 truck.^{[note 1]} The truck was produced by Asia Motors until Hyundai merged the company with Kia Motors in 1999.^{[note 2][5][6]} The KM450 is an export name designated by Kia Motors, and the name is used widely outside of South Korea for both old and new variants.

• K311 (KM450) Cargo Truck: Introduced in 1980.^[6][9]
  • K311A1 (KM450) Cargo Truck: Upgraded variant. Introduced in 2003.^[6][9]
  • K311A1 (KM450) Chassis^[10]
  • K311A1 (KM454) Shelter Cargo
• K312 (KM451) Ambulance: Introduced in 1982. All were converted to K311 cargo truck after replacing with K312A1 by 2014, 5 years ahead the schedule.^[11][9]
  • K312A1 (KM451) Ambulance: Upgraded variant. Introduced in 2005. It has an air conditioning system, 22 additional kits, and other life support items.^{[11][9][12][13]}
• K313 (KM452) Shop Van: Introduced in 1985.^[14][9]
  • K313A1 (KM452) Shop Van: Upgraded variant. Introduced in 2007.^[14][9]
• K314 Communication Equipment Installation Vehicle^[15]
• K315 Cipher Vehicle^[15]
• K316 (KM453) NBC Reconnaissance: Introduced in 1996.^[9][16]
• K317 Biological Reconnaissance: Introduced in 2002. Developed to prepare for possible biological terrorism during the 2002 FIFA World Cup.^[9][17]
• K319 Bulletproof Truck: Introduced in 2004. Developed for use by the Zaytun Division during the Iraq War.^[9][18]

Other variations with unknown/no given model number^[19]

• 1¼ ton Cargo Truck - RHD
• Artillery Commanding Vehicle
• Cargo Truck - Generator
• Communication Shelter Mounted Vehicle
• Electronic Weather Monitor Mounted Vehicle
• Field Catering Truck
• Military Caravan
• Smoke Generator Mounted Vehicle

List of guns or other systems mounted on the truck

• 70 mm MLRS: (prototype)
• CS/LM5 rotary gun:
• DShK heavy machine gun:
• K-1450-06 command post:
• K4 automatic grenade launcher:
• KP-SAM MANPADS:
• KPV heavy machine gun:
• Liberator Elevated Tactics System:
• M2 Browning heavy machine gun:
• Mk 19 grenade launcher: ^[20]
• Taka-1 MLRS: ^[21][22]
• Taka-2 MLRS:
• ZPU anti-aircraft gun:
• ZU-23-2 anti-aircraft autocannon:

Foreign variants

• SarSar-1: Sudanese armored reconnaissance vehicle based on the KM450 chassis.^[23]
• SarSar-2: Sudanese armored reconnaissance vehicle based on the KM450 chassis.^[24][23]
• Bogdan Bars-6: Ukrainian armored utility vehicle based on KM450 chassis.

 Benin

• Operated since 2018.^[25]

 Botswana

• Received KM450 in 2018.^[26]

 Brunei

• Received KM450 in 2018.^[27]

 Cambodia

• South Korea donated 50 K311s in 2012.^[28] Another batch of unspecified number of K311s was donated in 2017.^[29][30]

 Central African Republic^[31]

 Chile

• Used by Chilean Marine Corps.^[32][33][1]

 Colombia

• Uses K311s.^[1]

 Mali

• Local assembly by Korean-Malian joint company Wad Youngsan Industries S.A. in Banankoro since 2016.^[34]

 Mongolia

• South Korea donated 13 K311s in 2012 along with other equipment to support Mongolian UN PKO missions in Afghanistan and Sudan.^[35][36][37]

 Niger

• Operated since at least 2019.^[38] Acquired 100 vehicles in July 2022.^[39] Acquired 100 vehicles in January 2023.^[40][41] Purchased 100 vehicles for Nigerien special forces in March 2023.^[42]

 Philippines: Received 1,368 KM450s, 120 KM451s, 157 K311s, and unknown number of KM452s.

• 651 KM450s purchased in 2007.^[43] South Korea donated 157 K311s in 2010.^[44] 60 KM451s purchased in 2012.^[45][46] 717 KM450s purchased in 2015.^[47][48] 60 KM451s were added in 2016.^[49] Some retired K311s were offered to civilian market.

 Saudi Arabia^{[50][better source needed]}

 South Korea

• Operates more than 10,000 vehicles as of 2016.^[1]

 South Sudan

 Sudan

• Local production by the Military Industry Corporation (MIC) of Sudan.^[1]

 Thailand

• Royal Thai Army^[51]

 Ukraine

• The KM450 chassis was used for manufacturing Bogdan Bars-6 armored vehicle since 2015. In 2021, the chassis was selected to replace R-125 KshM, which is a command vehicle variant based on the UAZ-3151. It was produced by Bogdan Motors to supply to Telekart-Prylad for installing K-1450-06 KshM on the truck. However, Bogdan Motors filed bankruptcy in same year. 20 chassis were purchased at the auction by the charity created by Serhiy Prytula, and were donated for military use.^{[52][53][54][55][56]}

• Dodge M37
• Kaiser Jeep M715