This papercraft is a Mark VI helmet, one part of MJOLNIR Powered Assault Armor/Mark VI, which was the sixth and last of the [GEN1] versions of the MJOLNIR Powered Assault Armor, from the Halo 3 video game series. The paper model was created by daniel. There is also a Mark V Helmet Papercraft at PaperCraftSquare.
The helmet is one of the most vital aspects of the MJOLNIR system. It is made of Titanium and contains key features like a Heads Up Display that links to the brain and hands, and can identify equipment and display information about it when it is picked up by the wearer. Another feature is the direct neural interface system which connects to a SPARTAN-IIs neural implants. Two core processor chips are implanted into the subjects skull in the rear of the head.
This is essentially comparable to an on board computer using parts of the human brain for processing - when the connector at the rear of the subjects head and receptors in the brain link to the helmets on board sensors it creates the neural link needed to move the MJOLNIR suit. The helmet also contains other equipment to protect and aid the user in hostile conditions. This includes: filters to remove toxins from the atmosphere, a supply to provide air to the wearer during EVA, thermal and motion sensors, communications, solar-powered lighting, and imaging and video gear. The helmet also contains the A.I housing, where a ship-borne A.I chip is inserted, located on the back of the helmet. [Source: wikia]
You can download the papercraft model here: Halo 3 - Mark VI Smooth Helmet Papercraft Free Template Download