Pentagon acquisition chief Ellen Lord sent a memo to defense contractors today laying out which ones are deemed "critical" by the U.S. government and therefore expected to maintain their normal work schedules, despite the national emergency over COVID-19. "The Defense Industrial Base is identified as a Critical Infrastructure Sector by the Department of Homeland Security," she wrote in a March 20 memo . "The DIB sector is defined as the worldwide industrial complex that enables research and development as well...