You are the Master Chief, all that remains of a classified military project to build a series of genetically enhanced super-soldiers. You are humanity's last and best hope against the Covenant -- but you're woefully outnumbered, and survival is not
Human soldiers have used performance-enhancing equipment for hundreds of years, and your MJOLNIR battle suit represents the current pinnacle of military technology. As a product of the SPARTANN-II project where you were bio-engineered and technologically enhanced for better reflexes, eyesight and coordination; the addition of your MJOLNIR armor makes you nearly invincible.
The battle suit utilizes a neural interface implanted in your brain. Your armor's movements and weapons are controlled at the speed of your thoughts. The battle suit also contains a layer of crystal that forms a network capable of supporting starship-grade AI so you can overpower alien computer systems if necessary. The suit's shell is comprised of many layers of strong alloy, and a refractive coating to disperse energy weapon hits. Internally, the suit regulates temperature and can reactively change in density if necessary.