Factual error: Chris Kyle did not make Chief after his first deployment. He made Chief during his fourth deployment.

American Sniper (2014)
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Directed by: Clint Eastwood
Starring: Bradley Cooper, Sienna Miller, Jake McDorman, Luke Grimes
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Taya Renae Kyle: If you think that this war isn't changing you, you're wrong. You can only circle the flames so long.
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Chosen answer: Chris has "shooter's strawberries" on his elbows, which are red callouses caused by lying in the sniper's position for long periods. He notices the same marks on the elbows of the father, and realizes that he too is a military sniper.
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