Quiet, known to the Soviet forces as Tixij, was a female assassin during the 1980s. Originally an assassin for XOF, Quiet later defected to Diamond Dogs after being defeated by Venom Snake. Quiet wore a minimal amount of clothing at all times because she could only drink or breathe through her skin following parasite-treatment due to the serious injuries she had sustained while trying to kill Big Boss during the hospital raid; wearing too much clothing would lead to suffocation. After being defeated by Venom Snake in Afghanistan following a tense sniper duel, Quiet became a prisoner at Mother Base until she was allowed to accompany Venom Snake on missions as a buddy. Her weapons included two lethal sniper rifles nicknamed Wicked Butterfly and Sinful Butterfly as well as the non-lethal Guilty Butterfly.