The US military never thought that there was any nuclear attack inbound so not at all. The real danger was that either North Korea thought that this alarm was

The US military never thought that there was any nuclear attack inbound so not at all. The real danger was that either North Korea thought that this alarm was cover for us preparing for a counterstrike after we preemptively nuked them, causing them to decide to launch, or that Trump saw the news on Fox and ordered a launch and didn't let himself be dissuaded.