In world war one, helmets where made of steel, to help protect your head from any bullets or other weapons used (:
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Telephone Operator's Helmet was the nickname it was given because it was also used by Field Telephone Operators.
A blitzkrieg is a German word that means 'lightning war'. It was a process used in World War II where large amounts of men and material invaded a country overwhelming its defenses. Several countries gave up within weeks.
Normally leather was used for boots.
It was called The Enigma Machine for German encoding.
Enigma was used for war. Enigma was first invented by German engineer in World War 1.