- last post: 01.01.0001 12:00 AM PDT
My theory, it aint him...
Look at the armour, various aspects of it are different.
Two prominent ones are the helmet, looks different at the front. The protuding "thing" on his left shoulder (which was part of his MJOLNIR armour form Halo1, subsequently downsized in Halo2) is back.
And a third thing is his use of an assault rifle.
All these would point to that Spartan being one of the surviving spartans (see the halo books) and having just been rushed back into active service, is still equipped with "partially" outdated armour and weaponary.