Chris Kyle's (Bradley Cooper) mission is to protect his brothers in arms while being a prime target of insurgents. Despite the danger, as well as the toll on his family at home, Chris serves through four harrowing tours of duty in Iraq, personifying the spirit of the SEAL creed to "leave no one behind." But upon returning to his wife, Taya (Sienna Miller), and kids, Chris finds that it is the war he can't leave behind.