Not exactly true. Our systems are designed around ICBM detection. A tactical/suitecase nuke like the old US Army Green Light teams wouldn't trigger that. In f

Not exactly true. Our systems are designed around ICBM detection. A tactical/suitecase nuke like the old US Army Green Light teams wouldn't trigger that. In fact, it would likely take awhile to trace. The "limited nuclear war" concept. https://en.wikipedia.org/wiki/Green_Light_teams https://en.wikipedia.org/wiki/Green_Light_teams