The U.S. Navy has ordered more airborne electronic attack systems from Northrop Grumman Corp. with an estimated value more than $125 million, Northrop said Monday.

The systems, which have been used to support military operations in Afghanistan and Iraq, are designed to identify, degrade and destroy radar-guided air defense and communications systems, according to the Los Angeles-based defense contractor.

The equipment will be installed on U.S. Marine Corps Prowler aircrafts based at the Marine Corps Air Station at Cherry Point, N.C.

This is the fourth set of systems the Navy has ordered from Northrop. The first of nine new kits will be delivered in the third quarter of 2010.

Shares of Northrop Grumman were down 60 cents, or 1 percent, to $62.40 in morning trading on the New York Stock Exchange.