In June of 2008, Deadliest Catch: Alaskan Storm was a video game released for the Xbox 360 and PC and allows you to feel how it is to be a greenhorn or a captain of one of five boats during the Crab Season.
It was crab fishing that won him over and he worked as a greenhorn (or fisherman in training), unpaid, for several years before becoming captain of his own vessel.
Vying for a greenhorn on a crabbing vessel is competitive and the more experience applicants have, the better.
Or you can be lazy and choose Greenhorn.
He was no greenhorn, but what was he doing in the desert?
Maybe he wasn't a saddle bum, but only a greenhorn would think he could live off the barren land that surrounded them.
Probably another greenhorn Pete had to pull out of a scrape.
Of course, even a greenhorn could follow the wagon tracks they would leave in the sand.