Alex Mason (Earth-7162)

"Hey Woods, you look like hammered shit."

- Alex Mason to Frank Woods

Captain Alex Mason, also known by the aliases Willem van der Berg, Al, and Sierra Oscar Golf X-ray, is a former CIA operative and retired Marine Force Recon Captain. He worked as a Studies and Observation Group operative during the Vietnam War at the side of Frank Woods, Joseph Bowman, and Venom Snake. After being captured during a failed assassination mission against Fidel Castro, Mason was imprisioned in the Soviet gulag Vorkuta for years, where he befriended the former Red Army captain Viktor Reznov.

Source

 * https://callofduty.fandom.com/wiki/Alex_Mason