In “American Sniper,” Bradley Cooper is Navy SEAL Chris Kyle, known as the most lethal sniper in US military history.

In real life, Kyle was killed at a Texas shooting range in 2013, allegedly by a former Marine.

He served four tours in Iraq and his family paid the price.

Sienna Miller plays Kyle’s wife Taya in teh movie.

In the movie, Kyle goes back and forth between the US and the war zones.

“I mean, that was the point of the movie for us. We really wanted to show the schizophrenic nature that these men and women have to go through by hurdling both continents,in such an immediate way and the toll that takes,” said Cooper.

Cooper said he knew he had to do Kyle’s widow Taya and their two children justice. He said Taya’s response was a meaningful response to the film.

“Without question, it was Taya Kyle’s response, for both of us,” Cooper said.

“She said, about Bradley, she felt like she’d spent two hours with her husband after watching the film, which I think is about as good a compliment as you could ever receive,” said Sienna Miller.

Cooper’s performance has already earned him an Oscar nomination for best actor – his third.

His last nomination was for “American Hustle,” which was shot in Boston.

“You know, I was there when the bomb went off at the marathon, and for me, it was the solidarity that I witnessed, gathering around those who were injured. I went to about five different hospitals,” Cooper said.

There were rumors he would return to Boston for his next film.

“We’ll see, but I think there is a film that will shoot there, and I hope to be a part of it,” he said.

American Sniper is now in theaters.

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