After getting rescued during your first encounter with the Man on Fire in the Prologue, follow the person down a corridor. Use the rail to your left to pull yourself up from the floor. Look closely at the bulletin board on the wall to see a poster that mentions Kojima Productions and inviting you to "Join the Fox Team". The booth number listed, CP 2308, is the actual number of the booth used by Kojima Productions at GDC 2013. You can rescue Hideo Kojima during the Side Op 112 Intel Agent Extraction mission. After doing so, he will return to Mother Base.