User blog comment:Zephalian/Close Quarters Trailer!/@comment-65.37.60.207-20120313141822/@comment-4431589-20120314003644

Actually the wireframe, textures, and sounds are all copyright protected.

No big deal. COD just uses computer generated sounds while BF uses actual gun sounds. And since BF3's graphics are different from the MW games, there's ought to be a slight difference.