Though many defense contractors say they're now taking a break from mergers and acquisitions, some say they expect to be able to capitalize on a wave of deals once the COVID-19 pandemic has come to an end. In a call with analysts last month, Mark Aslett, the chief executive of Mercury Systems, said the M&A market "is effectively shut right now." But, "once we get through the crisis, we anticipate seeing more opportunities than before," he said. "Certain companies may...