This is a GENTEX HGU-84/P aviation helmet (flight helmet pilot helmet) used by the USN US Navy and USMC US Marine Corps. The size of the PILOT helmet is LARGE. The visor is a dual visor (bungee type) with smoke and clear. The liner is a Zeta liner made by Oregon Aero.
ANVIS-10 NVG night vision device/mount (replica) is a bonus. It was discarded and disposed of by the military, so it has scratches, stains, scuffs, etc.