Which innovative technology was first widely implemented in military MREs (Meal, Ready-to-Eat) in the 1990s, revolutionizing field feeding capabilities?

The Meal, Ready-to-Eat (MRE) represents one of the most significant product innovations in military history, transforming how soldiers are fed in the field. These self-contained meals have evolved dramatically since their introduction, influencing civilian emergency rations and camping food. This poll tests your knowledge about this crucial military product innovation that changed battlefield logistics forever.

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Flameless Ration Heaters (FRH) that use water-activated exothermic reactions to heat food without fire
Vacuum-sealed titanium containers that could withstand extreme battlefield conditions
Solar-powered thermal wraps that heated meals using stored sunlight energy
Freeze-dried nanotech food particles that expanded to full meals when exposed to saliva