Add Yahoo as a preferred source to see more of our stories on Google. A fighter aircraft taking off - wz94/Shutterstock For decades, US Navy pilots have worn either the HGU-55P or HGU-68P helmets.

The ultimate piece of flight gear.

For decades, US Navy pilots have worn either the HGU-55P or HGU-68P helmets. Developed by Gentex Corp., the HGU-55P was first introduced in the 1980s, with the HGU-68P following in the 1990s. Since ...