Is there a legal form called 'The FreeWill Document' for one to sign (for the purpose of Intentionally Staying) prior to a Forced Evacuation or Martial Law?

I was an Intentional Holdout during Katrina. The Friday of that weekend, I heard a short mention, on the radio, about a so called ‘FreeWill Document’ (to Stay), whereas you fill in & sign your vital SSN sort of information – that if you died as a result of the catastrophe – the government wasn’t responsible. My research online has been futile, – however – I did hear of a small group of 50 or more, in, I believe, Missouri (around 2008) that Refused to leave because of flooding and they all signed this mysterious document. Everyone’s lives are relative to various financial, logistical & social situations. Not all Acts of Nature are worthy of Forced Evacuations, but the Upper Hand of the Government is increasingly leaving the Individual without a Voice during such a sensitive time. One reason for some to stay, is simply to be an eye and ear for their various friend’s and family’s businesses and residences. Yes, they’re taking a chance but we’re taking numerous risks every day of our lives, just surviving the polluted, air, water and ground we travel each 24 hrs. that we’re granted. Thanks for your interest. Looking forward to all responses. . .