What key training status does NASA acknowledge by referring to its new recruits as 'astronaut candidates'?

Answer

The title relates to selection and training status as much as flight experience.

The existence of 'astronaut candidates' (ASCANs) implies that the title can be acquired through selection and rigorous training status before any spaceflight has occurred.

What key training status does NASA acknowledge by referring to its new recruits as 'astronaut candidates'?

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What are the qualifications to be called an 'astronaut' ? - YouTube

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