Lockheed Martin Corp., Littleton, Colorado, has been awarded an indefinite-delivery/indefinite-quantity contract in the amount of $581,638,399 for Global Positioning System (GPS) IIR IIR-M III IIIF On-Orbit Support. This contract will provide engineering services to the operational units in support of GPS Block IIR/IIR-M/III/IIIF satellite constellation. It encompasses, but is not limited to, technical expertise, system administration for government furnished property, cybersecurity, special studies, data collection, and anomaly resolution. Work will be performed in Colorado Springs, Colorado; and Los Angeles, California. The Space Systems Command Directorate of Contracting, Peterson Space Force Base, Colorado Springs, Colorado, is the contracting activity (FA8823-22-D-0002).