Northrop Grumman Systems Corp., Aerospace Systems, Melbourne, Florida, is awarded a $9,529,494 modification (P00035) to a previously awarded fixed-price-incentive-fee contract (N0001915C0091). This modification adds scope to procure two additional E-2D Delta System/Software Configuration Build IV (DSSC4) developmental test aircraft, increasing the quantity from three to five. This modification also provides for the upgrade of the mission computer display memory from 32GB to 64GB. Work will be performed in Melbourne, Florida (64.3%); McLean, Virginia (9.3%); McKinney, Texas (7.8%); Rolling Meadows, Illinois (5.7%); Broomfield, Colorado (4.0%); Ronkonkoma, New York (2.6%); St, Augustine, Florida (1.6%); Gardena, California (1.1%); and various locations within the continental U.S. (3.6%), and is expected to be completed in June 2022. Fiscal 2021 research, development, test and evaluation (Navy) funds in the amount of $102,393 will be obligated at time of award, none of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.