"You're a Spartan, Deryck. Your main priority is to always protect all of the human colonies, even if you have to give up your life. This is what you're made for, after all these years of training and hardships. Never forget that, you're a Spartan... of Delta Company."
Lieutenant Commander Ren-172, born as Ren T. Jones and later changed to Ren Darraway, also known as Sierra-172 and Codename: MARINER was a SPARTAN-II of the SPARTAN-II Program, Class II. Born to Richard Jones and Jane Dawson, Ren had to be abandoned and sent to a child-care facility due to both of his parents being ODSTs in the UNSC Marine Corps. Since both of his parents were former ORION operators, Ren was a Spartan 1.1, a name which was used to describe the children of ORIONs. Left at an orphanage on Circumstance, Ren was selected and soon later abducted as a candidate for the second class of the SPARTAN-II program. Taken to Reach, Ren was trained there for seven years as part of Sage Team before being selected for an early augmentation procedures. After surviving, Ren was placed in the top-secret VELOX Unit, along with fellow Spartans Varun-173 and Samir-292.
In 2552, Ren-172 was recruited for a mysterious mission known as Operation: INCOGNITO, which involved traveling deep behind enemy lines, to learn more about the Covenant's remnant factions, along with other Spartans such as Kyle-B115. In reality, he was secretly recruited for training the fourth-generation of the SPARTAN-III program, known as Delta Company. Delta Company was maintained by ONI Section Three's Beta-5 Division, and none other, in order for the Spartans to act as ONI's hitmen, assassinating individuals who were a threat to ONI, or to act as bodyguards to the most important ONI officers. After their training ended in 2557, continued working for ONI secretly, receiving a set of MJOLNIR GEN2 armor. When VELOX Unit resurfaced during the Created crisis, Ren secretly conducted his own investigations to find his lost teammates and seek their assistance.