Chris Redfield is an American Special Operations Agent (SOA), as well as a Special Operations Unit (SOU) Captain of the Bioterrorism Security Assessment Alliance (B.S.A.A), of which he is a founding member, along with his long-time partner; Jill Valentine.
Chris is proficient with many types of weapons, particularly handguns, shotguns and sniper rifles. He is an expert marksman and once the S.T.A.R.S. top sharpshooter who won a shooting tournament, being the victor over Forest Speyer. His accuracy, precision and focus is fantastic, enabling him to hit long distance targets accurately. He is also an experienced knife fighter.
In addition to his weaponry skills Chris is very tough as an unarmed combatant. Chris was proficiently trained in several fighting techniques such as CQC. In Resident Evil 5 he has put himself through rigorous physical training to increase his muscle mass, making him incredibly strong and resistant. He is capable of sending lesser Majini flying, and able to bring the largest to their knees with a single punch.
http://residentevil.wikia.com/Chris_Redfield#Skills_and_AbilitiesMarcus led a promising military career during the Pendulum Wars. During the Battle of Epyhra, he abandoned his post to rescue his father, Adam Fenix. Marcus is unable to save his father and is later court-martialed and sentenced to 40 years in a dilapidated prison. At the beginning of Gears of War, Dom Santiago, his best friend and long-time comrade, liberates Marcus from the prison. He is recruited to help the ‘Delta Squad’ deploy the light-mass bomb, but the group sustains heavy casualties during their mission. When their commanding officer, Lt. Minh Young Kim is killed in battle, Marcus is promoted to the lead of the group. He retains the position throughout the Gears of War trilogy, and plays a pivotal role in helping humanity defeat the Locust Horde and Lambent forces and is instrumental in the destruction of both species, personally killing the Locust Queen and having a major role in the deaths of the two Locust Generals, RAAM and Skorge.
http://en.wikipedia.org/wiki/List_of_Gears_of_War_characters#Marcus_Fenix