I don’t know about the “quiet and efficient” but the rest of that describes a large armored personnel carrier: https://en.wikipedia.org/wiki/Armored_personnel_c

I don’t know about the “quiet and efficient” but the rest of that describes a large armored personnel carrier: https://en.wikipedia.org/wiki/Armored_personnel_carrier https://en.wikipedia.org/wiki/Armored_personnel_carrier