Safeguard ABM system and PARCS (1972-1976)
The Army built the Safeguard antiballistic missile system to defend a U.S. ICBM field in North Dakota. Its Perimeter Acquisition Radar, later renamed PARCS, tracked incoming warheads at the Cavalier site. Congress shuttered the system after arms control limits, but PARCS kept operating as a warning radar.
The Safeguard system was deactivated, and PARCS was converted to early-warning duty.
The Cavalier radar still runs today, now a target of the GBRD digitization program.
Shows how old the hardware is: the radar being modernized outlived the Cold War system that built it.
