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Northrop Grumman to upgrade LN-251 navigation system software on the CH-53K helicopter
WOODLAND HILLS, Calif., Feb. 29, 2012. Northrop Grumman Corporation (NYSE:NOC) has been awarded a Phase II contract by the U.S. Navy to modify existing software for the LN-251 embedded GPS/fiber-optic inertial navigation system (INS) on the new CH-53K Super Stallion helicopter.