It's nice to live in a country where you have that choice... quite a few have mandatory conscription when you turn 18 or so for men and women.
It's also interesting to see the statements here and notice the age of those making them. It's usually the older ones who see the necessity of something like this, when you are young, you think you are the one who got you where you are, not realizing a lotta people died before you to give you this opportunity. As much as you like/love your present state of life, those that are unwilling to fight for it could have it taken away in an instant. If people were unwilling to fight before, we would all be either under a Japanese or German dictatorship. Or a Russian communistic government where millions and millions died just for thinking like you do.
We could all be back in the middle ages living under a radical fundamentalistic Islamic theocratic government where the women aren't allowed to go outside without a male, all of us are wearing robes and sandals and no-one is allowed to cut their hair. There would be no internet, only state-run TV and radio, and all the men have mandatory military service as well... etc etc etc..
... if we all were unwilling to fight for our way of life.