Intended Environment – An office or consumer computer is intended for use in a very controlled shirt-sleeve environment with moderate temperatures and humidity and minimal dust. A military computer can be designed to operate in very adverse environments with extremes of temperature such as -20C to +65C operating, 5% to 95% humidity levels, and high dust loading in the air as well as other insults to the hardware. They may be required to operate in high salt environments such as on a ship or designed for high shock and vibration such as on a ship or submarine. Military computers may be intended for installation on aircraft in which case they need to be crash worthy and able to operate at high altitudes if in unpressurized aircraft. The same computer may be required to operate in Afghanistan as well as in Alaska with no change in the design.