Here are some fun wiki facts about Jameson Locke and some screen shots for the upcoming Halo 5 Guardians.
At one point, Locke was part of an Office of Naval Intelligence unit dispatched on a distant human colony to investigate terrorist activity. During the investigation, Locke and his unit discover an ancient alien artifact.
Sometime after 2553 Locke compiled a target profile report concerning the ArbiterThel ‘Vadam, detailing ‘Vadam’s personal history from the start of the Human-Covenant Warto the glassing of Reach and beyond. This report was later accessed by John-117.
Following the Didact’sattack on Earth, Locke was evidently tasked with tracking down MCPO John-117. To this end, Locke met with Arbiter Thel ‘Vadam and studied video recordings of the Master Chief’s exploits to better learn about the legendary Spartan’s history.