From Call of Duty - Wiki on Neoseeker

Playable Characters

Private Vasili Ivanovich Koslov - A private that serves in the Russian campaign in Call of Duty 2. He joined the helped fight off German soldiers.

Sergeant John Davis - A sergeant that served in the British campaign in Call of Duty 2. He fought in the Liberation of Caen and served with the famous Captain Price.

Commander David Welsh - A commander that serves in the British campaign in Call of Duty 2. He was a British Crusader Tank specialist and in his first battle in war, Welsh drove into a guarded battlefield... and won.

Corporal Bill Taylor - A corporal that serves in the American campaign in Call of Duty 2. He helped fight off enemies in the Battle of Normandy until reinforcements arrived. Taylor also looks very similar to Private Daniel Jackson in the movie Saving Private Ryan.