I had applied to this program once. I had suggested to draw people from an agricultural background (willing to put in long hours on dirty jobs), long distance runners (short term motivation, higher caloric efficiency), civic-minded volunteers (long term motivation), and long-distance backpackers (austere living conditions). I may have been slightly biased from personally having all of those backgrounds...
Anyway I didn't get in though I was in the top 10% and encouraged to re-apply in the future. I still think it would be fun, though obviously I need to step up my game as the application pools don't seem to be getting any smaller.