As for the special forces thing: My cousin (a marine) told me that sometimes during training you'll be taken aside and asked if you'd be OK with not seeing your family for 5 years. According to him, that sets off special forces training. The training is rigorous and the tests (physical and mental) tend to be incredibly demanding. As in "you'll wish you were dead," demanding. As far as I can tell, it takes a certain degree of extraordinary natural ability and uncommon devotion to one's nation to get into the special forces. My cousin also mentioned that most special forces guys tend to act very humble and low key, mostly out of the need to shield themselves with obscurity.