. >> reporter: for two years, filmmaker scott waugh, and mouse mccoy, worked around field deploymentseal guys in the movie. >> you're going to see some things in this film and say, no way that guy went through that. but it actually happened. we didn't create any fantasy elements there. >> reporter: that was the deal-breaker for the s.e.a.l.s. if they were going to star in a hollywood movie, they were in control over scenes that they thought had good evening too hollywood. >> in a mission, it's calm and collected. in "act of valor," you see calm and tempered communication. and that's the way it really happens. >> all clear. >> you look at the scene and they say, i would never do this. i would do it like this. and i would say, that's better than what we thought of. >> reporter: for an extra shot of danger and adrenaline, the s.e.a.l.s wanted and got live ammunition. not blanks. for lieutenant commander rorke and his fellow s.e.a.l.s, they didn't need rehearsing. >> we call in and talk to each other on missions when bullets are flying. it wasn't new for us in that part. and that made it