Well, first of all, I'm fairly certain it's a war sphinx, as it has a birdlike look, winged, you can definitely enter it and most of all it looks highly weaponized.
Next, in rags. Well, if he did go hunting for Halsey, who DID go wrong, he'd probably be doing something like that simply to hide. Mjolnir has it's own power source, right? Simple.
However, I doubt that this is in Africa. And I'm judging that based on the massive orange ball in the distance that may (or may not) be a planet. As far as I know, Earth didn't have that yet but I could totally be wrong.
In any case, I'm calling it right now. 1. In the first mission or one of the first few, Chief has to fight his way out of UNSC.
2. 'Im lost, no waypoints. Where the heck do I go. Explore...explore....'