http://www.gameinformer.com/b/news/archive/2015/09/08/konami-warns-of-game-breaking-metal-gear-solid-v-the-phantom-pain-bug.aspx?utm_content=bufferb2738&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer
Don't use Quiet as your buddy on mission 29 or 42 or you may end up with a game-breaking glitch