Metal Gear Solid 5: The Phantom Pain - Side Ops 01 Extract

As soon as you complete this mission, you can start interrogating Soviet soldiers.

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How to Get Quiet in Metal Gear Solid V: 11 Steps (with Pictures)

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Metal Gear Solid 5 The Phantom Pain Side Ops Guide: All 157 Missions, Side Op 150 And More

Hideo, Metal Gear Wiki

11. Extract the Highly Skilled Soldier 01 - Metal Gear Solid 5: The Phantom Pain Guide - IGN

After installing the latest MGSV patch, you can get Quiet back

Metal Gear Solid 5: The Phantom Pain - Side Op 11 Extract the Highly Skilled Solder

Metal Gear Solid 5: The Phantom Pain - how to make GMP quickly