The only things missing are the chinstrap and oxygen mask. Has definitely been there and seen the elephant!
The item "KOREAN WAR NAVY GENTEX H-4 FLIGHT HELMET EARLY JET FIGHTER PILOT! Size 7 3/4" is in sale since Monday, April 23, 2018. This item is in the category "Collectibles\Militaria\Korea (1950-53)\Original Period Items". The seller is "pp_sharikov" and is located in Las Vegas, Nevada. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica.