What secondary function was intentionally built into the design of the WWII American M1 helmet?

World War II brought numerous innovations in military equipment design, with soldier protection being a primary focus. The iconic M1 helmet became one of the most recognizable pieces of American military equipment. Beyond its protective qualities, this helmet had a unique design element that served multiple practical purposes on the battlefield. Test your knowledge about this famous product design that influenced military equipment for decades to come.

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It could be used as a cooking pot for field rations
It contained a hidden compartment for storing ammunition
The chin strap was designed to double as a tourniquet
It had a built-in radio receiver in the liner