Boeing’s defense programs are caught in the crossfire after workers rejected a new labor contract and went on strike in the Pacific Northwest. Over 30,000 Boeing machinists have stopped working at the company’s aircraft-production facilities, impacting the Air Force KC-46 tanker and Navy P-8 maritime aircraft. Late Thursday, workers voted down a proposed agreement between Boeing and the International Association of Machinists and Aerospace Workers. Boeing chief financial officer Brian West warned of negative margins in the defense business, with nearly a billion dollars in losses last quarter. The losses are partly due to disruptions in fighter programs and fixed-price development contracts like the Air Force’s T-7 trainer jet and Navy’s MQ-25 unmanned refuelers.