Helicopter military 3D model is available on CGTrader for $59. Original author: dannymax0000. Specs: 41889 polys, 22314 verts.
STL (Stereolithography, filesize: 2 MB), OBJ (OBJ, filesize: 2.75 MB), 3DS (3D Studio, filesize: 929 KB), MAX (Autodesk 3ds Max, filesize: 3.78 MB), FBX (Autodesk FBX, filesize: 1.23 MB)