Metal equipment 5 phantom pain how to let Kojima Hideo join the army

Dear, do you know that in "Metal Gear 5 Phantom Pain", the player can find a soldier who is based on the game's main creation, Hideo Kojima, so what should the specific player do to get the soldier to join? If you don't know the player, let's take a look at the system to bring you relevant tips and tricks, I hope to help everyone.
When the main line task (7th level) was over, Kojima volunteered to join the team. In addition, as an inheritance special item, there was the original sneak suit, mosaic SS skin, golden prosthetic (ability and The same as the original, the color is different.) By the way, the archive of my "original explosion point" is 100% of the completion rate. As long as the level corresponding to the "original explosion point" is completed, it can be inherited, but all GZ unlocked soldiers will be unlocked after 12 chapters.