if no additional shell racks were added. At maximum capacity its hull could store up to thirty-nine rounds of 90mm ammunition and still seat four additional passengers. Subsequent V-150 models incorporated a slightly larger turret armed with a much more powerful Cockerill Mk.III 90mm gun, the same as that carried by the EE-9 Cascavel. A third fire support option involved the retrofitting of the Commando chassis with the complete turret and 76mm L23A1 gun of the British FV101 Scorpion tracked reconnaissance vehicle. Marketing for the V-150 family was halted in 2000. In 2010, Federal Defense Industries announced that they entered into an agreement with Textron Marine & Land Systems in order to provide authorized aftermarket parts, support and other types of assistance for the V-100/150/200 since FDI maintains a technical library for spare parts. In 2011, Napco entered into an agreement with Textron to provide authorized aftermarket parts, support and other types of assistance for the V-100/150. Operational use The Commando was originally deployed to South Vietnam in September 1963 for use by the U.S. Army Military Police, United States Air Force, United States Marine Corps and allied forces including the Army of the Republic of Vietnam (ARVN). It was introduced in Vietnam as the XM706 Commando first to the ARVN who loaned the first examples to the U.S. Army in June 1967. By the end of 1968, the U.S. Army had purchased its own version of the armored car, the XM706E1, later standardized as the M706. Within the U.S. Army it was affectionately known as the Duck, or the V. The main differences between the XM706 and XM706E1/M706 were in the design of the gas tank fill port covers, side windows, front vision blocks, and most importantly in the weaponry. The XM706 featured two .30-06 caliber M37 machine guns, while the XM706E1/M706 for the U.S. Army featured two 7.62mm NATO M73 machine guns for better ammunition commonality with existing weapons. The ARVN, on the other hand, were still using a variety of weapons in the .30-06 caliber and had relevant ammunition in their supply train. In practice, the ARVN found the standard two-gun armament to be lacking and often mounted an additional M1919A4 machine gun on a standard tripod mount at the rear radio operator's hatch. A number of their V-100s were also refitted with the combination turret armament of one M37 and one .50 BMG-caliber M2HB machine gun.