Boeing is being hit with its second strike in less than a year after 3,200 hourly workers walked off their jobs building military aircraft.

Boeing is preparing for a major strike at its St. Louis-area defense factories. The move comes after union members rejected the company's revised contract offer. The strike will see some 3,200 machinists walk off their jobs starting midnight today. This is the first such action since 1996 when a similar strike lasted for 99 days.