Director Kathryn Bigelow's 2012 film "Zero Dark Thirty" centers around the real-world May 2011 raid into Pakistan that ended with the death of Osama Bin Laden. The movie delves into some of the backstory, including fictional characters to boost the film's narrative. During the raid, the film uses special stealth helicopters to enter Pakistani airspace, land at the target compound, and ultimately withdraw after a successful mission.  While these aircraft look real enough to viewers, however, the stealth helicopters used in the film were indeed fabrications. That said, the folks who made them clearly studied the available information to produce something…