Being a CD is a no-holds-barred effort with respect to physical and mental prep. I spoke to two guys, one current and one post, and they both said the same things:
If you want to be able to bang this course out you would want to be physically in such superb shape you could walk through a cinderblock wall with nothing but sunglasses and a can of your favourite soft drink. Generally, you'll want to be in the realm of 2.5 km in under nine minutes, can do over a hundred presses, situps and be doing in the order of an hours worth of cardio a day. Quite simply, you can go through the recruitment process, but by the end of your basic training you want to be in that realm.
As for recruiting I can only give some general tips: You have to be pretty smart about how you approach problems, most of the ways they will test you have a "gotcha" in there somewhere. Quick maths, good communications skills and the ability to think under pressure (doing three unrelated things at once is a great way to test this, but too many ways they can do it to clue you in).
-Know your equipment; know navy ships, helicopters and some general info on armament (type and number of guns, missile type for instance).
-Don't restrict yourself to Navy, know Air Force and Army bases, equipment, etc without sounding like a fanatic.
-Know your ranks by rote, and learn who is in charge of the country and the military (Defence Minister, Chiefs, etc)
- Before you go, find all CD related documents from the recruiting website, and print them out. Learn the info on there, job descriptions, roles, pay.
- When you contact recruiting, have all your school records, certificates, birth documents and so on before you roll up. That way you can get in there and hopefully chat with a service member (not a civvy). They are the goldmine. Show them you've learned the job description/ranks/people, and then ask them what you need to know, see and do to get through your interview process.
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The lifestyle? Don't kid yourself. It isn't barrels of fun every day, but it's challenging, and sure beats sitting in an office chair getting beasted by the board of directors. You earn your keep hard, but it's enjoyable in the end. You'll make stacks of friends, do things you've never thought you'd ever do - those are the most fun parts and sure enough your buddies back on civvy street will wish they'd done it too. Especially as a CD, you'll get to play with some pretty awesome stuff.