Mission Matters Podcast How Missile Defense Actually Works
Nov 4, 2025
Lieutenant General Pat O’Reilly (ret.), former Director of the U.S. Missile Defense Agency, shares decades of missile defense leadership. He breaks down missile classes, the kill chain, and firing doctrine. He contrasts kinetic interceptors with directed energy and explains sensors, fusion, networking, and the role startups in future architectures.
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Which Phases Are Best To Intercept A Ballistic Missile
- Missile flight phases: boost, post-boost, mid-course, terminal; post-boost and mid-course are generally the most favorable for interception.
- Boost is short and unpredictable; terminal has plasma and high disruption.
Match Interceptor To Atmospheric Regime And Geometry
- Interceptor choice depends on geometry and atmosphere: Patriots/SM-2 for inside-atmosphere threats, THAAD/SM-3 for upper-atmosphere, GMD for exo-atmospheric ICBMs.
- Being near the launch or between launch and defended area ('goaltending') matters more than weapon alone.
Proliferation And Mobility Shift Defense To Post-Launch
- Missile proliferation and mobility have increased dramatically; many long-range missiles now use mobile launchers making pre-launch targeting much harder.
- This forces reliance on post-launch sensors and agile defenses rather than fixed pre-emptive targeting.