The Army has put Boeing on notice that within 30 days, the government could terminate for default the company's contract for developing future software-defined radios, according to sources and documents. A "Show Cause Notification" letter from the service's Communications-Electronics Command dated April 25 tells Boeing that it is not measuring up to program office expectations on its contract for the Joint Tactical Radio System Cluster One, officials said. Despite an "excellent" functionality demonstration that took place last week, the government...