As a former Navy guy, I'm usually part of the cabal that playfully teases Marines about "inferior intelligence". Reality, its just a service rivalry thing... Some of the most impressive human beings I've ever met are hard core, dedicated Marines. They perform some of the most nasty, unenviable jobs very heroically, and we love them for it.
Below is my favorite clip from the movie Full Metal Jacket. Light up a cigar and enjoy. Amen and Semper Fi.