Operation Officer Alex Keller[1] is a character featured in Call of Duty: Modern Warfare, Call of Duty: Modern Warfare II and Call of Duty: Modern Warfare III. Formerly an operative of the Special Activities Division of the CIA, Alex worked with the Urzikstani Liberation Force and its commander Farah Karim in her resistance against Roman Barkov. He takes over the position of the ULF's second-in-command, once held by Farah's brother Hadir, and remains part of her army as of 2023.

Sergeant Keegan P. Russ[1] is a supporting character in Call of Duty: Ghosts. He is a former member of the United States Marine Corps and the scout sniper for the Ghosts. He is rather quiet and not very social around people, but is known to complete combat operations under extreme conditions..