These are completely new helmet models for one of the pilot peds in GTA V.
I have replaced 2 original GTA helmets with a Black Hawk helmet plus gunner mask and an AH-64D Apache pilot helmet.

I'd recommend downloading my 160th SOAR pilot textures to go with the helmets:
https://www.gta5-hub.com/player/160th-s-o-a-r-pilot-nightstalkers


Pilot model name for spawning is:

s_m_m_pilot_02

Helmets can be selected under the "hats" entry.

Note: They're not perfect and probably not final. I want to improve the materials position of the Blackhawk helmet (mask is too low), but I have a few problems there)