Boeing workers at three Midwest plants where military aircraft and weapons are developed voted Sunday to reject the company’s latest contract offer and to continue a strike that started almost three months ago. The strike by about 3,200 machinists at the plants in in Mascoutah, Illinois, and the Missouri cities of St. Louis and St. Charles is smaller in scale than a walkout last year by 33,000 Boeing workers who assemble commercial jetliners but threatens to complicate the aerospace company’s progress in regaining its financial footing. “Boeing claimed they listened to their employees – the result of today’s vote proves they have not,” Brian Bryant, president of the International Association of Machinists and Aerospace Workers, said in a statement.