Unit 8200 symbol, left. Unit patch, right.
They begin the initial recruitment stages early in high-school, they're looking for extremely bright, geeky types programming in the dark in their mothers' basements.
They don't like the athletic, gym-rat mental profile, they want something else entirely, think Zuckerberg but tending not to make the lie-detector machine blow up.
They are BEYOND us in the electronic realm.