克里斯·凯尔（布莱德利·库珀 Bradley Cooper 饰）原本是一名普通美国牛仔，“911”事件以后他以30岁的高龄参加了海豹突击队，并成为了伊拉克战场上的一名优秀狙击手。参军之后克里斯认识了塔雅（西耶娜·米勒 Sienna Miller 饰），两人很快结婚生子，但是随着克里斯的多次出征伊拉克，两人的家庭发生了很多问题。战场上的克里斯十分优秀，被队友称呼为“传奇”，恐怖分子以高额奖金请职业狙击手猎杀他，但屡次都未得手，可是身边的队友却一个个遭遇不测，虽然妻子三番五次恳求他退伍，但是他抱着为队友复仇的信念最后一次出征…… 本片改编自克里斯·凯尔的自传《美国狙击手》Chris Kyle was nothing more than a Texan man who dreamed of becoming a cowboy, but in his thirties he found out that maybe his life needed something different, something where he could express his real talent, something that could help America in its fight against terrorism. So he joined the SEALs in order to become a sniper. After marrying, Kyle and the other members of the team are called for their first tour of Iraq. Kyle's struggle isn't with his missions, but about his relationship with the reality of the war and, once returned at home, how he manages to handle it with his urban life, his wife and kids.
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