US Military Aviation Flight Helmets US NAVY late 40s-50s The development of Jet aircrafts during the late 40s led the understanding that the flight headgear used so far on propeller aircraft was not any more suitable to adequatly protect the pilots during the new typic flight and combact performances of the jet aircrafts. In particular the increasing noise of the aircraft engine and the utilization of the ejection seat system at higher speeds and altitudes led to the.
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