Luftwaffe Kopfhaube (aviator's cap) without microphone and headphones – WWII
 During World War II, German Luftwaffe pilots wore special Kopfhauben —leather or fabric flying caps—as part of their standard equipment. These caps protected against the cold at high altitude and served as a carrier for communications equipment. However, there were also versions without an integrated microphone or headset , designed for specific functions or circumstances.
 Features of the "silent" Kopfhaube
 A Kopfhaube without a microphone (Kehlkopfmikrofon) and headphones (Hörer) was simpler in design and was used in situations where communications equipment was superfluous or transferred to another crew member.
 Usage
 Usually worn by passengers , ground crew during test flights , or crew members who did not require direct communication, such as a flight engineer or observer.
 Sometimes also used during training flights , or by aircraft crews where only one person was actively communicating with the ground or other aircraft.
 a must for every luftwaffe collector.