“American Sniper” is shaping up to possibly be one of Bradley Cooper’s defining roles. The film, which also stars Sienna Miller and is directed by Clint Eastwood, now has a new trailer detailing more of the drama that will make this film a possible Oscar contender.

The film is based on the real story of Chris Kyle, “the most lethal sniper in U.S. military history.”

“U.S. Navy SEAL Chris Kyle is sent to Iraq with only one mission: to protect his brothers-in-arms. His pinpoint accuracy saves countless lives on the battlefield and, as stories of his courageous exploits spread, he earns the nickname “Legend.” However, his reputation is also growing behind enemy lines, putting a price on his head and making him a prime target of insurgents. He is also facing a different kind of battle on the home front: striving to be a good husband and father from halfway around the world.

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 SEAL creed to “leave no man behind.” But upon returning to his wife, Taya Renae Kyle (Sienna Miller), and kids, Chris finds that it is the war he can’t leave behind.”

The film also features the acting talents of Jake McDorman, Navid Negahban, Luke Grimes and Keir O’Donnell. Screenplay credits go to Jason Hall, based on the book by Chris Kyle with Jim DeFelice and Scott McEwan.

“American Sniper” will be in select theaters Christmas day and nationwide Jan. 16, 2015. Learn more about the film at americansnipermovie.com.