This is a 3D model of the Extravehicular Mobility Unit (EMU) which is originally made by NASA. The original file is provided on the NASA website.

http://www.nasa.gov/multimedia/3d_resources/assets/emu.html

Basically, you may use the contents of the package file (EMU.unitypackage) as you like. Please see the usage guideline for the details.

http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html