Among occupations with a steady monthly salary, non-commissioned officers probably have the lowest educational background, right?

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I don't mean daily manual labor, but among occupations that receive a steady monthly salary.
People online say that instead of becoming an officer through an OCS (Officer Candidate School), people become NCOs (Non-Commissioned Officers), but they say that if people could become officers, they all would, and in reality, they don't choose NCO roles. Since people in their early 20s are more attracted to higher ranks and higher pay rather than stability,
Since there is an officer role that serves as a superior alternative for college graduates, NCOs probably have the lowest educational background, right?
These days, since everyone goes to a four-year university and enters the workforce later, they say that more than half of police officers and prison guards are four-year college graduates, but since there are virtually no college graduates among NCOs...