there is also a reference to the WWII in Metal Gear 2: Solid Snake for MSX. when Petrovich, Natasha and Snake are escaping through a sewer, she remembers what her mother told her about whe she was a child:
"Fate? Yeah, maybe... I was told a lot when I was a child. From my er... about the Warsaw uprising in World War 2 Poland. She ran through a sewer for days and fled the Nazis. Soaked with mud... blackened... one ouldn't even recognize faces. She is still haunted by the war, even today..."