Another reason pilots wear helmets is because they hold your radio earphones. Military regulations require it. When jets became standard, the air forces switched to the hardened ‘brain bucket’ currently used today, though the purpose of this is merely to protect a fighter pilot’s head from being bashed against the canopy during high speed maneuvering, and ejection — not to save him in the event of a crash. Similarly, the kamikaze pilot’s helmet merely helped him complete the trip, not survive it.