Low poly military base collection 3D model is available on CGTrader for $6. Original author: jakubhumeny20. Specs: 74000 polys, 75000 verts.
STL (Stereolithography, filesize: 7.17 MB), OBJ (OBJ, filesize: 7.61 MB), BLEND (Blender, filesize: 8.8 MB), FBX (Autodesk FBX, filesize: 2.78 MB)