Sniper Elite

Sniper Elite, also known as Sniper Elite: Berlin 1945, is a 2005 tactical shooter created by UK video game developer Rebellion Developments. In 2012, the game was remade as Sniper Elite V2.
The main character is Karl Fairburne, an American OSS secret agent disguised as a German sniper. He is inserted into Battle of Berlin in 1945, during the final days of World War II, with the critical objective of obtaining German nuclear technology before the Soviet Union.