I don't know whether ministers in the US have to apply for some licensing or whether they are simply grandfathered in or included by definition.
I don't know about today, but in 1968 in Arkansas all I had to do to be able to be a state-recognized minister was go down to the courthouse, tell them I was a minister (Universal Life Church, which a friend got me ordained in by sending off a self-addressed stamped envelope), and signing my name in the book. Since a very great number of little fundy churches require only a "calling," not training, I'll bet it's still that easy. Well, here in the Bible Belt, at least.
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