Which innovative product design feature was specifically incorporated into the M1 helmet that distinguished it from previous military helmets?

The M1 steel helmet is one of the most iconic pieces of military equipment design of the 20th century. Introduced during World War II, its distinctive shape and functionality represented a major advancement in personal protective equipment for soldiers. This poll tests your knowledge about this revolutionary product design that influenced military equipment for decades and became a visual symbol in war photography, films, and historical documentation.

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A two-piece construction with a separate liner that could be worn alone as a field cap
Built-in radio communication system for battlefield coordination
Transparent ballistic face shield that could be lowered for additional protection
Modular camouflage panels that could be swapped for different environments