Flameless ration heater
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A flameless ration heater, colloquially an MRE heater, is a form of self-heating food packaging included in U.S. military Meal, Ready-to-Eat rations since 1993.
A pair of flameless ration heaters
A Mounted Ration Heating Device, a prototype Flameless Ration Heater. Service members would power the device using the attached cable and a running vehicle. Up to four MRE pouches could be heated at once.
The instructions advise that the heater should rest against a "rock or something"
Unitized Group Ration
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The Unitized Group Ration is a United States military ration used by the United States Armed Forces and Department of Defense. It is intended to sustain groups of American service members with access
A Marine holding two UGR-H&S rations
An Air Force airman placing UGR-H&S rations in an immersion heater
A Marine looking through UGR-A boxes in a freezer
Marines serving UGR-Ms during a family career awareness event