The "KNIL" units are the Royal Netherlands Indies Army -- the East Indies Colonial Forces of The Netherlands.  These specially designated formations should only be purchased for colonial scenarios.*
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These motorized Dragoons companies were usually organized with Bantam Blitz Buggies as the standard vehicle, but can use any vehicle with at least a carrying capacity of 4. Essentially, that will be all the vehicles that will appear for purchase EXCEPT the true armoured cars (the Marmon Harringtom A/C, the Alvis Straussler, the Otter II, the Greyhound and the Staghound).*
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Be sure to check the Carrying Capacity of the vehicle before purchasing.