The Netherlands Purchasing Commission, buying equipment in the U.S.A. for the KNIL, had to buy from commercial sources. As the KNIL had already tested and bought some Marmon-Harrington vehicles (e.g. the TA-30 Artillery Tractor), the N.P.C. placed an order for artillery tractors, trucks and 628 tanks at Marmon-Harrington {in 1938/39}
The CTL-4TAC, an improved and turreted model of the CTL-6, was ordered along with its complementary CTLS-4TAY model. According to a Dutch source the CTLS-4TAC was a light 7.5 ton two man tank armed with two .30 cal Browning machine guns, one in the turret offset to the left. It had right-hand drive because traffic was left-handed in the Dutch East-Indies. An identical model, the CTLS-4TAY had its turret on the right and left-hand drive. Because the turret rotation was fouled by the drivers position and could only rotate through an arc of 240 (!), the CTLS-4TAC and -4TAY had to be used in action in pairs
When the Japanese Army invaded the Dutch East-Indies, an officer managed to unload the first shipment of seven Marmon-Harington CTLS-4TAY tanks; these were immediately put into action. {On 2 March 1942 the Japanese landed near Soebang on West-Java and the 24 operational machine-gun equipped tanks obtained "a considerable success".}