The AN/FPQ-16 Perimeter Acquisition Radar Attack Characterization System (PARCS or EPARCS) is a powerful United States Space Force phased-array radar system located in North Dakota. It is the second most powerful phased array radar system in the US Space Force's fleet of missile warning and space surveillance systems. EPARCS is operated by the 10th Space Warning Squadron, Space Delta 4, and maintained by Summit Technical Solutions, LLC. In addition to contractors, NORAD has U.S. and Canadian military members assigned to the facility.