Lance Corporal Jones was a UNSC Marine sharpshooter and Orbital Drop Shock Trooper stationed at Earth in 2552. He was under the command of Gunnery Sergeant Marcus Stacker, and was probably part of the 7th Orbital Drop Shock Trooper Battalion of the 105th Marine Expeditionary Unit also.
During the first day of the Battle of Earth, his squad was dispatched from the UNSC In Amber Clad at Cairo Station to relieve the UNSC's ground forces and to board the Prophet of Regret's assault carrier. Shortly after deployment, their Pelican dropship was shot down over Old Mombasa by a Scarab walker. He survived the crash, but his squad was soon attacked by a Covenant patrol.
When the squad was pinned down by a Kig-Yar sniper, Jones, as the squad's own sniper, neutralized the Jackal with his Sniper Rifle System 99C-Series 2 Anti-Matériel B, causing the majority of the other Covenant troops to flee the area. A camouflaged Sangheili then snuck up on the squad and took Jones hostage by holding an energy sword held at the sniper's throat. One of Jones' squadmates, Butkus, wielding an overcharged plasma pistol, along with Gunnery Sergeant Stacker with his BR55 Service Rifle, killed the Elite and freed Jones.
Like all ODSTs, Jones is very tough and professional. He is an excellent marksman, and is not afraid of enemy snipers. He also has a notable sense of humor, even in combat, as evidenced by his desire to provide the Jackal a "Welcome to Earth" 'gift basket'. When he is being held hostage by an Elite, he orders the team to kill the Elite instead of saving him.
- Jones is probably named after Jason Jones, one of the co-founders of Bungie, who also worked as the Project Lead for Halo 2.
- Jones has much in common with "Snaky", including both soldiers being ODSTs, both being Marine snipers, and both being lance corporals. It is unknown if "Snaky" could have escaped Installation 04, although he could have escaped along with Sergeant Stacker and Chips Dubbo.
- Another Day at the Beach (First appearance)