Which comprise the Upgraded Early Warning Radar (UEWR) systems?

• A. The Solid State Phase Array Radar Systems (SSPARS) at Clear SFS, Alaska; Thule AB, Greenland; Fylingdales RAF, United Kingdom; Beale AFB, California; and Cape Cod SFS, Maine; along with the Perimeter Acquisition Radar Attack Characterization System (PARCS) at Cavalier SFS, North Dakota.
• B. The Solid State Phase Array Radar Systems (SSPARS) at Clear SFS, Alaska; Thule AB, Greenland; Fylingdales RAF, United Kingdom; Beale AFB, California; and Cape Cod SFS, Maine; along with the Perimeter Acquisition Radar Attack Characterization System (PARCS) at Cavalier SFS, North Dakota.
• C. The Ballistic Missile Early Warning System radars on the East and West Coasts of the United States.
• D. The Solid State Phase Array Radar Systems (SSPARS) at Fylingdales RAF, United Kingdom and the Ground-based Electro-Optical Deep Space Surveillance Site (GEODSS) at Diego Garcia.

Answer: (A)

The Upgraded Early Warning Radar network relies on solid-state phased-array radars (SSPARS) distributed across key sites for broad, rapid detection, plus the Perimeter Acquisition Radar Attack Characterization System (PARCS) at Cavalier for close-in perimeter sensing and attack characterization. The set of SSPARS sites—Clear Space Force Station in Alaska, Thule Air Base in Greenland, Fylingdales in the United Kingdom, Beale Air Force Base in California, and Cape Cod Space Force Station in Massachusetts—together provide wide-area coverage across multiple approaches. PARCS at Cavalier Space Force Station in North Dakota then feeds detailed, near-field data to enhance the overall alert picture. This specific combination defines the UEWR system, which is why it’s the best answer. Other options either omit several SSPARS sites or mix in components not part of UEWR (such as older BMES radars or GEODSS), which serve different surveillance roles.