Northrop Grumman to Upgrade US Military’s Radar Warning Receiver Capability to Digital Standard arif2020-11-02T02:41:53+00:00 Northrop Grumman Corporation received a $91 million contract for the additional production of AN/APR-39D(V)2 Northrop Grumman to Upgrade US Military’s Radar Warning Receiver Capability to Digital Standardarif2020-11-02T02:41:53+00:00