$7 PASGT Helmet Low-poly 3D model by Akinaro. Available on CGTrader with 15363 polys and 7880 vertices. Check it out on CGHub.
OBJ (OBJ, filesize: 246 MB), FBX (Autodesk FBX, filesize: 244 MB), TEXTURES (Textures, filesize: 240 MB), JPG (JPG, filesize: 240 MB), PNG (PNG, filesize: 240 MB), GLTF (glTF, filesize: 675 MB)