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The federal government actually does have protections for people who are not in the probationary period, which is why they only fired people in the probationary period, because if they tried to fire tenured employees they’d have a much bigger fight. But that probationary period can last from 1 to 2 years, and also kicks in again for anyone who starts in a new position.
So much of modern tech is just misusing words they heard from sci-fi stuff that was already misusing words they heard in physics class.