Military EMP testing facilities cannot simulate real-world full-spectrum HEMP

The U.S. has only a handful of EMP simulators — most notably the ATLAS-I (Trestle) facility at Kirtland AFB, which was decommissioned in 2004 and partially dismantled. The remaining simulators at Patuxent River and White Sands can produce partial E1, E2, or E3 waveforms, but none can generate a simultaneous full-spectrum HEMP pulse (E1 + E2 + E3) at the field strengths a real nuclear detonation at 200-400 km altitude would produce. This means the Department of Defense cannot fully validate whether hardened military systems actually survive a real HEMP event. Testing is done piecewise — E1 susceptibility in one chamber, E3 in another — and then results are stitched together with models. But coupling effects between simultaneous E1/E2/E3 pulses interacting with complex modern electronics (multilayer PCBs, nanometer-scale semiconductors) are nonlinear and cannot be accurately modeled. Any "EMP-hardened" label on military equipment is based on incomplete testing, which means we do not actually know if critical command-and-control systems survive a real attack. This persists because building a full-spectrum HEMP simulator would cost an estimated $500 million or more, and the Comprehensive Nuclear-Test-Ban Treaty (CTBT) norm discourages any test that could be perceived as nuclear weapons development. Congress has repeatedly deferred funding. The last time ATLAS-I was fully operational was 1991.