Halo 5: Guardians Officially Announced

[Silko]

Oh shoot I forgot E3 was next month! I'd better clear some time to vampire myself inside so I don't miss anything.

That is what DVR/TIVO is for!!

[Graycochea]

"The most secretive section, Section Zero's existence is not general knowledge outside ONI. Details of its role and operations are limited. Based on the records of an AI named Melissa, it is thought to be ONI Internal Affairs, charged with rooting out and eliminating illegal programs. The true nature and activities of Section Zero are highly classified and unknown outside the ONI command hierarchy. Zero is, essentially, an internal investigations division that polices other ONI activities.[5]

This section has gained notoriety as the section that keeps and maintains sealed SPARTAN-I Program file archives, including Avery Johnson's. As Internal Affairs it enforces the rules and ensures standards are met. It is authorized to use lethal force in the course of its operations."

http://halo.wikia.com/wiki/Office_of_Naval_Intelligence

What if whomever this is is hunting Master Chief? Trying to bring home a failed "experiment". Keep ONI clean of any political wrong-doing. That would be cool. Or he's going after Halsey because she's a traitor.