Perfect. Your work in the cadets shows commitment and you will be familiar with military life etc. Don't dismiss world affairs, there's a lot going on and there is no reason why you could not bring it up.
You just need to convince them you are a good chap. Taking the time to come on here and seek advice shows initiative and character. Nothing in life is guaranteed but I think you will certainly have a good shot at it. Be confident, be yourself and enjoy the experience.