In order:
Signals intelligence proximate to the plan's inception that'd likely thwart things before the situation escalated
Monitoring of the incoming track and its electromagnetic emissions
Observation of the blast from a variety of sensor platforms
A WC-135 flying near the atmospheric blast area to determine isotope composition
In order:
Signals intelligence proximate to the plan's inception that'd likely thwart things before the situation escalated
Monitoring of the incoming track and its electromagnetic emissions
Observation of the blast from a variety of sensor platforms
A WC-135 flying near the atmospheric blast area to determine isotope composition