<P> Sound editing and mixing work took place at Todd Soundelux, with Wylie Stateman serving as the supervising sound editor . Stateman recorded on - location sound during filming, placing microphones on the actors' backpacks and clothing "so (the viewers) would hear explosions and bullets going by as though (they) were with these guys as they were being attacked ." In creating sound effects for the environment of each scene, Stateman relied on foley design, rather than traditional sound effects . </P> <P> The two visual effects companies for the film were Industrial Light & Magic (ILM) and Image Engine, with overall supervision by Jesper Kjölsrud and Grady Cofer . In total, the film has over 400 visual effects shots . ILM was responsible only for creating a helicopter crash sequence in the film . Berg requested that the sequence be done by ILM, who had also worked on his previous film Battleship . Image Engine's effects work consisted mainly of set extensions and location enhancements; scenes were supplemented with computer - generated mountains, buildings and backgrounds, as well as muzzle flashes for firearms . Film editor Colby Parker Jr. explained, "The sets of the villages were only one or two huts and then Image Engine built everything around those . Same for the SEAL base . There were only a few real buildings and from that they built out a larger base ." </P> <P> American post-rock band Explosions in the Sky scored the film with music composer Steve Jablonsky . The band had previously scored Berg's 2004 film Friday Night Lights, and Jablonsky had previously scored Battleship . Jablonsky said of the collaboration, "It was great . I didn't work directly with them because they're in Austin, Texas and I'm in L.A. I spoke to them on the phone and I think sixty, sixty ‐ five percent of the scores is them . We ended up doing our own things . We tried to not have two totally different sounding scores ." </P> <P> Berg said, "(Jablonsky) did the last reel; the band Explosions in the Sky did pretty much did everything else . They have an emotional, tender quality to their music, even when it gets aggressive . I didn't want the score to be overly aggressive, I wanted it to be haunting and emotional . Steve Jablonsky came in at the end to do something more traditional, but when Steve does "traditional", it's not the usual strings . He created a wonderful sound at the very end ." Songs featured in the film include "Canned Heat" by Jamiroquai, and "Heroes" performed by Peter Gabriel and the New Blood Orchestra, which is played at the end of the film during a four - minute montage that features actual photos and videos of the fallen servicemen . </P>

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