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Military Rations: Field Ration D

The US Army Field Ration D (D ration or "D Bar"), developed by the Quartermaster Corps, was intended exclusively for survival. It contained three 4-ounce bars of thick, high-calorie chocolate.

Col. Paul Logan developed the bar in 1937 with the intent that it not taste too good, for fear the men would consume it rather than carry it until an emergency arose. He gave these requirements to Hershey: "...a bar weighing about four ounces, able to withstand high temperatures, high in food energy value, and tasting just a little better than a boiled potato."

U.S. Army Field Ration D
U.S. Army Field Ration D.

Today in WW II: 17 Jun 1940 As Germany overruns France, Allied troops execute Operation Ariel, the evacuation of France [15-25 June].  More 
17 Jun 1940 Luftwaffe bombs and sinks the British ship RMS Lancastria with the loss of 5800 troops being evacuated near Saint-Nazaire, France.
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D Rations or D-Bar

The D-Ration was designed to be highly portable, readily available for the soldier's emergency nutrition. D-Ration bars were wrapped in aluminum foil, then overwrapped and sealed in parchment paper. These were to replace the old World War I "iron rations." The researcher's intent was to get the highest caloric content possible in the smallest package, and yet retain sufficient palatability.

D-Ration packages and bars
D-Ration packages and bars.

According to Hershey Chocolate Corporation, the manufacturer, in 1939, they produced 100,000 units per day. By the end of 1945, production lines on three floors of the plant were producing a total weekly output of approximately 24 million units. It has been estimated that between 1940 and 1945, in excess of three billion ration units were produced and distributed to soldiers around the world. Also produced was a three pack of the four ounce bars intended to furnish the individual combat soldier with the 1,800 calorie minimum sustenance recommended each day.

Use of D Bar in Other Rations

The compact size and high caloric value of the D ration chocolate bar made it the choice to be included as a component of other rations. For example, they were used in emergency air crew "Bail Out" rations, 5-in-1 Small Detatchment Rations and others.

Original U.S. Army Field Ration D and packaging, photographed in 2001
Original U.S. Army Field Ration D and packaging, photographed in 2001.

On 27 August 1942 Hershey Chocolate Corporation received the first of five Army-Navy "E" awards for producing the "D" Ration Bar.

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