But you should also realize that in the US, a lot of job titles are ... hmmm... how shall I say this? Made to sound loftier than they are.
An electrical engineer, industrial engineer, mechanical engineer, biomedical engineer, chemical engineer, civil engineer, etc. absolutely has gone to college for a degree.
A "sanitation engineer" is a fancy name for a custodian/janitor.
An "agriculture engineer" COULD be (though not necessarily is) a farmer.
I"m trying to think of other jobs in that class, but it's after midnight and I'm drawing a blank. Perhaps some of my American colleagues here will chime in with other examples.