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For the weapons? Or for the pilots?

For the weapons, there are a few MW4 sound mods on Nexus Mods - I'd suggest looking at one of those and then try to apply the MW3 sounds to it in a similar fashion.

For voicepacks... that way lies insanity.
 
ya only the weapons. i had all the voice files at one point from the entire game but unfortunalty those have become lost to time and 3 computers and many reformats and failures