Best of Luck to you Punisher.
as to what tiffany and nbl were saying. the army can help make a boy a man, the army can teach you discipline. you can meet cool people in the army, you can learn some good lessons.
but!!! the army teaches you some stupid shit too! obeying orders whitout asking for reasons and so on. working like a machine. eating, sleeping shitting when you're told.
every experience influences you, some more some less. and when you're under the total control of someone, or you're in an extreme situation for long time, the effect it has on you is probable to be much greater.
...that being said, the army will have a great influence on how you think, how you look at stuff, strong character or not.
and to say you have to be weak or stupid, if you crack up after or during the real life experience of war... then there is no point in any further discussion.