Passage: When provided as an emergency field ration, military chocolate was very different from normal bars. Since its intended use was as an emergency food source, it was formulated so that it would not be a tempting treat that troops might consume before they needed it. Even as attempts to improve the flavor were made, the heat-resistant chocolate bars never received enthusiastic reviews. Emergency ration chocolate bars were made to be high in energy value, easy to carry, and able to withstand high temperatures. Withstanding high temperatures was critical since infantrymen would often be outdoors, sometimes in tropical or desert conditions, with the bars located close to their bodies. These conditions would cause typical chocolate bars to melt within minutes.

Question: What was military chocolates purposeful use?
emergency food source