Core Points - The International Association of Machinists and Aerospace Workers announced that Boeing's St. Louis area fighter jet assembly plant workers voted against the company's latest labor contract proposal [1] - Approximately 3,200 workers will begin a strike at midnight on August 4 [1] - Boeing's final proposal included salary increases and additional vacation time, which was rejected by the union [1] - Union members are primarily responsible for manufacturing Boeing's fighter jets, missiles, and ammunition, as well as producing components for Boeing's commercial aircraft [1]