This specific 3D model, "Military Soldier Clothing T-shirt Low-poly 3D model 92", is an asset made available by "Unknown author".
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STL (Stereolithography, filesize: 7.03 MB), OBJ (OBJ, filesize: 7.03 MB), FBX (Autodesk FBX, filesize: 7.03 MB), GLTF (glTF, filesize: 7.03 MB)