During Katrina the authorities began to move through neighborhoods and confiscate LEGALLY OWNED firearms for "the public safety". Many of which were never repatriated with their owners after the crisis passed.
PROTIP: If it floods, you lost your firearms in a flooding accident. Your rights will never be extended in a crisis, only restricted as the government seeks to regain control.
Kind of stole my thunder in that Maryland would love to go full Ray Nagin.
https://www.nytimes.com/2005/09/09/us/nationalspecial/police-begin-seizing-guns-of-civilians.html