In case anyone is wondering Gentex has 2 new helicopter helmets in their product line. When I visited
FlightSuits in San Diego a couple of years ago, I was told of the new models. They have a new one to replace the SPH-5 (standard helmet), that the US Army has designed (HGU 56). It is similar, but has square ear 'flaps'. The US Navy & Marines have gone with an HGU 84 helicopter helmet (top gun style). It is lighter than the SPH series. So you do have more than one option when it comes to Gentex helmets.
Cheers
Randy_G