I wonder how much notice we gave SK, China, Japan, Russia...
Bogey coming your way...
FOT&E (Fleetwide Operational Testing and Evaluation) missile launches are a routine part of Minuteman operations. Typically we test two or so missiles a year randomly selected from the 450 remaining (soon to be 400) Minuteman IIIs on alert.
The warheads are removed obviously and replaces with an instrumented reentry vehicle.