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.

Three Boeing defense plants face a strike as 3,200 machinists walked off their jobs. Members of the International Association of Machinists voted to strike.

About 3,200 union members at Boeing facilities in Michigan and Illinois went on strike at midnight on Monday after rejecting an offer from the company, the union said.