Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Model | Origin | Type | Version | In Service | Notes |
| --- | --- | --- | --- | --- | --- |
| AM General HMMWV | United States | Light Utility Vehicle | M998A1\n\nM1038A1\n\nM1025A1\n\nM1025P1\n\nM1114 | - | Divided into several variants and series, including armored variants. Uparmored variants (M1025P1 and M1114) are assigned with the Mechanized Infantry Division and Special Operations Command. |
| Maxi-Ambulance | United States | Light Utility Vehicle | M997A2 | 19 | 23 delivered to AFP on November 2011, PMC received 4 units. |
| M939 truck | United States | Heavy Utility Vehicle | M923\n\nM929\n\nM931\n\nM934\n\nM936 | >20\n\n-\n\n-\n\n-\n\n- | 20 M923 delivered in 2010, several more of different variants delivered in 2013. |
| M35 Truck | United States | Heavy Utility Vehicle | M35A1\n\nM35A2\n\nM35A3 | - | Divided into several variants and series, in service with the PA since the early 1960s. 90 more units delivered in June 2011, more delivered in 2013. |
| Mitsubishi Fuso Fighter | Japan | Light Utility Vehicle | FK Troop Carrier | - | Locally sourced. |
| CMC Cruiser | Philippines | 1/4-ton Light Utility Vehicle | Standard | - | Limited production run, introduced in the mid-1990s. |
| Delta Mini Cruiser | Philippines | 1/4-ton Light Utility Vehicle | M1777 | - | Divided into several variants and series, including short and stretched utility and armed variants, and modified variants for specialized units. |
| M151 | United States | 1/4-ton Light Utility Vehicle | M151 | - | In Service |
| Mitsubishi L200 | Japan | Light Utility Vehicle | L200 | - | Used by Military Police |
| KM-50 Series | Republic of Korea | Heavy Utility Vehicle | KM-500\n\nKM-503 | 6\n\n12 | KM-500 as 155mm Artillery prime mover, KM-503 tractor head for flat-bed trailers. 1st batch of 6 KM-500 delivered 2012. KM-503 delivered 2013. |
| KM-25 Series | Republic of Korea | Medium Utility Vehicle | KM-250 | <250 | In Service. Some units received by other armed services. |
| KM-45 Series | Republic of Korea | Light Utility Vehicle | KM-450 | 727 | 651 purchased by AFP on 2007 (590 for army) and 137 on December 2010 |
| KM-45 Series | Republic of Korea | Field Ambulance | KM-451 | 48 | 60 purchased by AFP in 2012, 48 went to the Army. |
Question:
how many models were made in the replublic of korea?
Answer:
4