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Character: Laslo Ković
Game: Battlefield 4
Summary: Agent Laszlo "Whistler" Kovic is a CIA agent featured in Battlefield 3 and Battlefield 4. It was stated he fought in the Bosnian War according to the cutscene before Kaffarov where he got his friends killed by a rocket attack due to them not being warned about it by their sentry, who was sleeping at the time...
More info: Battlefield.wikia.com