I think many youngsters are still fooled by the uniform. Didn't The Great War (no, the real one) teach us anything? When the soldiers left, it was said it would be a short, refreshing war ("La guerre fraîche et joyeuse", is what they said in France, for you who understand it). They also stated it would only last a matter of weeks, but we all know it didn't. At first, battles were fought on open land, and in fields. Many died, but that was it. Then the Industrial war kicked in. Trenches were dug, since armies were equally matched on the battlefield. New, deadlier weapons were discovered, such as aeroplanes, tanks and above all, gas (which is still used today, even the lethal versions).
I remember when I was in High school two years ago (a French school that is), we were studying WW1. They showed us pictures of the crippled from the war, both from gas and bullet wounds. A man had no jaw left. Another veteran had one half of his face torn off. Others had lost all of their limbs. Sure, this war was very brutal and amongst the bloodiest in the history of Mankind, but still , it is horribly overlooked.
If you're old enough, and you can stand to see horrible things (which you should if you intend to join the army), go to
www.google.com and research "WW1 corpses". That's what I did. And you can try
www.google.fr and research "gueules cassées". Nevermind the language, it's the pictures that count.
Now, you'll just be saying "Oh, this happened a hundred years ago, such things don't happen today". Well they do. If you want proof, go back to
www.google.com and check out pictures from, say, the war in Somalia, or maybe the victims from Hiroshima.
*edit* I want to warn you that these pictures are horrible. Don't watch them if you can't stand to see mutilated corpses. I'm not being sarcastic. Watch them ONLY if you're not sensitive.
Study these pictures for an hour or two, and then decide whether you want to join the army or not. I'm just saying this so that you know, at least, what you're going to see.
Sure, these things happen well enough on their own, but wars only make it worse. Much worse. Isn't there a way to serve your country without having to watch a man trying to hold his brains in after having been shot in the head? As long as there are people who want to join the army, these things will continue.