Great question — answering as the UphillTech team:
It looks like it was most commonly proposed in the 1980s to around 1994 and has since been brought up at different times by different people but was never implemented. Here are the results I found and the dates, and I only quoted the ones that don't require typing out the passages by hand. 1983 1984 1984 1985 Nash argues for the designation of "norescue wilderness" areas in some parks, places where visitors understand that they're on their own. "National park zones of self-reliance could be rated for visitor competency and should be accompanied by a program of wilderness licensing," he says, enlarging on the idea. "Let those who wish to enter no-rescue wilderness prepare themselves for that...
Full answer by Charlie Brumbaugh: https://outdoors.stackexchange.com/a/18592 (CC BY-SA 3.0).
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