Daimler Trucks North America (DTNA) will cease truck manufacturing operations at the St. Thomas, Ontario, plant in March as part of its decision to kill the Sterling truck brand. Workers at the plant currently manufacture Sterling medium- and heavy-duty trucks. The company also will close its Portland, OR, truck manufacturing plant, in June 2010. Western Star commercial production will be relocated to DTNA's Santiago, Mexico, plant, while production of Freightliner-branded military vehicles will be moved to one of the company's facilities in the Carolinas by mid-2010. Start of production at DTNA's new Saltillo, Mexico, plant is set for February. Workers at the plant will produce Freightliner's new flagship Cascadia model.