Which packaging innovation first allowed World War II soldiers to heat their rations without revealing their position to enemy forces through smoke or flames?

The packaging of military rations has evolved dramatically over centuries of warfare, reflecting both technological advances and changing battlefield conditions. From the simple cloth sacks of ancient armies to today's sophisticated MRE (Meal, Ready-to-Eat) packages, military food packaging represents one of history's most practical innovation stories. This poll tests your knowledge about a significant packaging breakthrough that changed how soldiers were supplied in combat.

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The Flameless Ration Heater (FRH)
The Heat Tab with Heat Shield
The Self-Heating Can with Internal Combustion Chamber
The Insulated Combat Thermos (ICT)