Lockheed Martin Corp., Fort Worth, Texas, is awarded an $841,490,130 firm-fixed-price, cost-plus-incentive-fee modification (P00003) to a previously awarded indefinite-delivery/indefinite-quantity contract (N0001923D0010). This modification exercises options to provide non-recurring site activation, initial sustainment and associated administrative support, to include fleet management, support equipment, pilot flight equipment, post ejection survival training material, program management, and earned value management in support of the F-35 Joint Strike Fighter program of the Air Force, Marine Corps, Navy, Foreign Military Sales customers, and non-Department of Defense participants. Work will be performed in El Segundo, California (52%); Orlando, Florida (44%); Fort Worth, Texas (3%); and Lancashire, United Kingdom (1%), and is expected to be completed in December 2029. No funds will be obligated at the time of award; funds will be obligated on individual orders as they are issued. Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.