My brother learned Cantonese fluently as a LDS Missionary. He then enlisted in the army after 9/11 and was given a battery of aptitude tests. I'm assuming this was one of them because he ended up at DLI learning Arabic and speaking that fluently as well.
DLI and being a Mormon missionary are about the two best places you can learn to speak a 2nd language fluently in a short amount of time.
DLI and being a Mormon missionary are about the two best places you can learn to speak a 2nd language fluently in a short amount of time.