How does one become a storm damage surveyor?

I know that damage surveying is important to gather information to accurate relate cost and power of a storm. I know that these people help give a better estimate for tornado categories after the twister has left. I've seen EF4s get post upgraded to EF5s because of specific damage that only can occur at that level. But I wonder, who are these people. I imagine they may have some education in meteorology and I also assume they are employed by NWS. But I have never met one. Would anyone be willing to help out?