Mentioned earlier, but deserves mentioning again-- air traffic controller. There's a nationwide open bid next month, here's the training/experience requirements:
"Applicants must have at least 3 years of progressively responsible work experience, a 4 year degree, or a combination of the two."
I've seen guys with nothing more than a high school diploma and three years working at the local McDonald's do well. I've also seen guys with multiple college degrees and ATP pilot qualifications wash out in the first six months.
It's all about aptitude for the job-- some folks have it, most folks don't. But if you have it, you can make well into six figures fairly quickly, enjoy great benefits, then mandatory retirement at age 56 (and optional retirement even earlier).