The company said it recorded a pre-tax loss of $477 million on its B-21 programs, and that investments to boost future B-21 production and higher-than-expected material costs were to blame. In a conference call, Kathy Warden, Northrop Grumman's president, said the drop was "largely relating to higher manufacturing costs" for the B-21, per The War Zone. She said it was "primarily resulting from a process change we made to enable a higher production rate, as well as increases in the projected material cost." ...