It is nothing new, just some administrative adjustments. Each service has this guidance (plus doctrine and other documents) to govern how they conduct “Defense Support to Civil Authorities.” This is DoD speak for helping out civilian authorities during an emergency/disaster.
The messages get reviewed, updated, and reissued every few years, even if there are no substantive changes.
Exactly. Everyone is getting their panties in a twist about a “Civil War.” DoD assets cannot be used in law enforcement activities in CONUS. PERIOD. This about disaster relief.