Dwight Eisenhower contributed to Executive Order 12919. I’ve read somewhere that it was written in 1950 (before Ike), and I don’t think he considered its possible use in peacetime.
Afaik - the USA has been in a state of emergency since about 1935, declared in the federal register by the executive branch.
The powers the federal government grants itself for these times is what is changing, slightly, under this executive order.
So, sadly, this *is* more routine than not.