I'm curious how they got the raw material to them. You can't make 5 tons of ice cream a day out of thin air. Were they shipped premixed sugar & milk or did they get straight raw ingredients and mix them onsite? I feel like the refrigeration capabilities are a pretty small part of the supply chain required to actually produce ice cream. Did they get a floating milk tanker to stop by every few days? Were they loaded on shore and just made do with what they had until the next port call?
Spray-dried whole milk especially, but also wartime dairy infrastructure in general on which powdered milk production depends, was a generation-defining nutritional element during that wartime period.