Tekla Research Inc.,* Dumfries, Virginia, is awarded an $8,000,000 modification (P00020) to a previously awarded cost-plus-fixed-fee, indefinite-delivery/indefinite-quantity contract (N0042118D0015). This modification increases the contract ceiling to provide continued systems engineering and technical services in support of air and ship integration, systems safety, mass properties, survivability, manufacturing and quality, air platform stores integration, metrology and systems security engineering for various Naval Air programs. Work will be performed in Patuxent River, Maryland (75.96%); Cherry Point, North Carolina (9.62%); Tucson, Arizona (4.81%); Lakehurst, New Jersey (1.92%); Ridgecrest, California (1.92%); Bangkok, Thailand (0.96%); and various locations within the continental U.S. (4.81%), and is expected to be completed April 2025. No funds will be obligated at the time of award; funds will be obligated on individual orders as they are issued. This modification was not competed. Naval Air Warfare Center Aircraft Division, Patuxent River, Maryland, is the contracting activity.