Soldier helmet - OPS (Polygon mesh 3D model) is available on CGTrader for $5. Original author: Cad-Saad. Specs: 4967672 polys, 14903016 verts.
MA (Autodesk Maya, filesize: 569 MB), OBJ (OBJ, filesize: 1.12 GB), FBX (Autodesk FBX, filesize: 222 MB), STL (Stereolithography, filesize: 237 MB), BIP (KeyShot, filesize: 398 MB), TEXTURES (Textures, filesize: 13.7 KB)