SPARTAN-IV

In the wake of the SPARTAN-III project’s success, the Office of Naval Intelligence secretly commissioned the activation of yet another project under the direction of CINCONI Admiral Margaret Parangosky: the SPARTAN-IV project. While these assets are now allocated to the UNSC military branch simply dubbed “Spartan,” these super-soldiers were handpicked from the field as military veterans who were capable of physical augmentation in order to wear Mjolnir armor, and had also met the litany of prerequisites required to receive title of Spartan.


(information from official Halo 4 site)