This is a contract extension for existing contractor Millennium Engineering and Integration Services (MEIS) to provide ongoing engineering support services for NASA ARC. The extension period is from April 1, 2026, through March 31, 2028, consisting of a one-year base period and two six-month options. The work involves supporting new mission concepts, developing engineering products, and operating critical research facilities like wind tunnels, labs, and fabrication shops. The contract is structured as a cost-plus-fixed-fee hybrid. This action is being pursued as a sole-source extension justified under a JOFOC.