Check out war helmet 3D model on CGTrader for $10. High-quality mesh by Hafcoy.
STL (Stereolithography, filesize: 239 KB), OBJ (OBJ, filesize: 1.03 MB), BLEND (Blender, filesize: 3.96 MB), FBX (Autodesk FBX, filesize: 2.67 MB), BIP (KeyShot, filesize: 423 KB)