The United States Space Force has yet to deploy all of its GPS III satellites, but construction on new, more sophisticated models is already beginning. The new GPS III Follow-on satellites, or GPS IIIF for short, will increase the constellation’s precision and interference resistance. Five of the intended GPS III satellites have been deployed, while three more have been deemed “ready for launch” but are being stored by prime contractor Lockheed Martin. The other two are still being tested. Lockheed Martin has a deal with the Space Force for up to 22 GPS IIIF satellites.