>All countries needed an army. In some countries all citizens must have to serve their army. In some countries it's a volunteer serving. Who is needed money they do this serve. They think so it's an oppurtunity for them. Yes it's an oppurtunity; because only poor people needs money and them voluntery so rich people don't serve army because of poor people.
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>Think a bit. If all american citizens would be rich how can USA find soldiers? There is a hidden injustice. It hidden by capitalism mask...

I think you have a good point here. The poor are the fodder for the rich's wars.

An all volunteer professional military is much more willing to fight that a conscript army. In the case of conscripts their heart won't be in it or they might not even fight. The professional nature of the US military is one of its greatest strengths. Inserting mandatory wiki link http://en.wikipedia.org/wiki/Conscription#Conscript_quality