This GENTEX H-3 sports a very interesting squadron insignia. According to USN Tailhook Association publication "The Hook", it should be a variation of Composite Squadron VC-11, an AEW unit flying the Douglas AD-3W Skyraider from various Aircraft Carriers during the conflict (codes ND).
 
The owner of the helmet (either Pilot or Radar Operator) was named J.N. Pierce.
 
An original small wool lucky charm was hanging from the side.