http://www.military-today.com/trucks/m1070_het.htm With the introduction of the M1A1 Abrams main battle tank into Service, the US Army's existing tank transporters were unable to carry the load. A contract was therefore awarded to the Oshkosh Truck Corporation to develop and manufacture a new heavy duty tank transporter which emerged as the M1070 Heavy Equipment Transporter; an order for an initial 522 units was originally placed and production commenced during July 1992. Up to date 1 179 tractors and trailers were built. The M1070 replaced the M911 heavy equipment transporter in service with the US Army.