Board Thread:General Discussion/@comment-166.137.88.23-20130610185107/@comment-1504072-20130619075044

TTS did not change the canon and the English dialogue was not re-recorded for the sole purpose of "correcting" the translation from Japanese. It was carried out due to low quality of the original sound recordings, and they decided to tweak a few lines from the original translation while they did so. Some lines might have been closer to the Japanese script, but others were kept the same, e.g. Big Boss falling into a coma, rather than being made sterile due to combat injuries (retconned to radiation in MGS3).