After the posting fiasco I committed last time here: >>20561 , let's continue.
So in the '60's the infantry needed an armoured transport vehicle which could support them the fights as well. They had the FUG, so they built upon it and developed it. Got a tower with a machine gun, it could transport 9 soldier (a "rifle" squad), it was still amphibious and ensured some protection against gas attacks and radiation. They called it Páncélozott Szállító Harcjármű (PSZH, = Armoured Transport Fighting Vehicle).
It was quite a success they could sell a few hundred to DDR. These were later dumped into Yemen.