Another contract proposal has been rejected by Boeing workers who now have been on strike for nearly six weeks from three Midwest plants where military aircraft and weapons are developed.

The vote on Friday refusing the latest proposal sends the workers back to the picket lines, according to the union representing the 3,200 striking workers who build fighter jets, weapons systems and the U.S. Navy’s first carrier-based unmanned aircraft. Fifty-seven percent of members voted against the proposal, the union said.

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“Boeing’s modified offer did not include a sufficient signing bonus relative to what other Boeing workers have received, or a raise in 401(k) benefits,” the International Association of Machinists and Aerospace Workers District 837 said in a statement.

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