The real ones are the quiet pros. They don't brag.
I'd say the real ones are the real ones - the ones that completed a tough Assessment and Selection course followed by a long, intense period of training and then normally deploy to a foreign country shortly afterward where they put their lives on the line. Remember that 90% of them are strong Type-A personalities and with that comes a bit of cockiness. Some are louder than others but they've all earned the right to say or do whatever they would like.