Lissen Aztec, and without the least hint of superiority to my Army and Air Force friends here). If you really want tough, you want a marine fighter pilot. On the days the Air Force won't fly at all because of the weather, we're on the high seas doing controlled crashes on the pitching, heaving decks of aircraft carriers (otherwise known as landings).
And there is no uniform in the world more beautiful than Marine formal mess uniform.
Yeru - what is the oldest a man can be and volunteer for service in any of the branches? Do you know?