“The exercise was held from May 8 to 9, 2024, at the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Maryland, and at a Federal Emergency Management Agency (FEMA) site in Denver, Colorado.”
Article refers to a PDF of the report it’s based on:
https://www.jhuapl.edu/sites/default/files/2025-04/Space-Weather-TTX-Report-Summary-v3-FINAL.pdf
If you want to renounce your US citizenship to get away from that onerous requirement, you have to pay a fee (about $2k) and also get screwed on a lot of US taxes on investments (forcing you to treat all capital gains as realized, for example). Part of my definition of freedom is that you don’t have to pay someone money for permission to leave.