Before that the Army will be in charge and civilian disarmament will be ordered "for the good of everyone". Zones will be pacified and "weapons caches" found by the army in house to house cleansing operations. Ala Iraq.
The military does not have the athority to disarm the citizens, and they know it.
By federal law, the military cannot be used as a police force inside the U.S.
Note in New Orleans last fall, the military only fired in self defense, at people who fired guns at them first.