As the Iran war has shown, detecting and sweeping mines is one of the biggest challenges for the U.S. Navy . Meanwhile, the sea service also has to worry about detecting submarines operated by China, Russia and other nations. But rather than separate sonars and helicopters for spotting mines and subs, the Navy is exploring the convenience of having one sonar that allows a single helicopter to perform both missions . The service, therefore, is looking for a helicopter-borne dipping sonar capable