Sergeant Patrick O'Neil is a playable character in Call of Duty: Modern Warfare: Mobilized.
O'Neil's career begins when he is deployed to a train station with his squad to find major arms dealer Colonel Ayala, rumored to have supplied Farhad with the nuclear device. The Colonel is found dead, and Captain Bell orders him to download files. The squad then defends the extraction point until their Pave Low arrives.
After that, he is deployed near a factory where the device is being assembled. He plants the charges while the Captain disables any security measures. They are then sent to intercept a convoy carrying the nuclear device. They fight their way through a thick jungle. While the Sergeant unpacks the Javelin, O'Neil disables the communications tower. However, the team attempting to grab the nuke is killed and the nuke escapes. The squad then gets on a boat and escapes with SAS operative Rook.
O'Neil then is deployed to find an operative who may know the location of the Nuke. After fighting through several buildings, destroying several tanks, the squad finds the operative. O'Neil then grabs a sniper rifle and eliminates enemy mortar crews. They are then deployed into a compound while an AC-130 provides cover. They fight their way through an old office and are then ambushed. A friendly airstrike is called in on a hostile tank. He then enters the facility. Just as the door is closing on the room with the nuke, O'Neil slides in while the Sgt. Walker. and Cpt. Bell provide covering fire. O'Neil disables the nuke just in time and is extracted safely with Gopher Squad.