Does everyone I extract join Mother Base?

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Inspired by this question: How do I get S+ or better soldiers? I recall that the staff at Mother Base need to convince each potential recruit to join the ranks. I've also heard a rumor that the chances are better the higher Big Boss's heroism is.
Do some of the soldiers I extract decide not to join? What are the factors that affect this decision?
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Should I extract everyone MGSV?
Leave No Man (or Woman) Behind. Early in Metal Gear, every soldier you can extract is a potential source of cheap labor and growth. While concentrating your efforts on valuable Specialists and prisoners is important, it's not a bad idea in early stages to grab some cannon fodder for your roster.How do you extract the mother base soldiers?
USE THE CARDBOARD BOX: Sneak up to the MB soldier while using the cardboard box and the target will stop and salute Snake. This will give you the chance to extract him while he's saluting.How do you get quiet on Mother Base?
Visit Quiet at Mother BaseCall up your iDroid and initiate a return to Mother Base, choosing the Medical Platform as your Landing Zone. Once you touch down, 111-Visit Quiet will be added to your Side Ops mission list. Select it, then follow the yellow objective marker down to Quiet's holding cell.How do you build Mother Base fast?
MGSV: The Phantom Pain Best Way to Extract The Wandering Mother Base Soldier Guide
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