The actress plays CIA agent Jen, who had a crucial role in tracking bin Laden to a compound in Abottabad, Pakistan, where he was killed on May 2nd, 2011.
"We did extensive research. Books upon books. I read Lawrence Wright's 'The Looming Towers', I read Michael Scheuer's book on Osama bin Laden. I got to know my subject inside out," contactmusic.com quotes Chastain as saying.
Oscar-winning director Kathryn Bigelow's movie has been shrouded in secrecy, with those involved, including the film's stars, director and writer Mark Boal.