et bien j'ai regardé sur le net et visiblement :
1. You Spared Quiet's life at the end of Mission 11.
2. Quiet is available (She is not recuperating)
3. Your Bond with Quiet is at its maximum level
4. You have seen the cutscene at Mother Base where scientist is exiled
5. You do not use the "Butterfly (front) design in your emblem".
du coup, j'ai fais tout cela , mais toujours rien, je vais faire la 43, on verra bien