Should we have mandatory service obligations?

<span style="color: rgb(51, 51, 51); font-family: 'lucida grande', tahoma, verdana, arial, sans-serif; line-height: 17px;">I think it would be a good idea to make it mandatory in the US for all 18-25 year old citizens to perform 2 years of civil service (military, law enforcement, fire-fighter, etc.) I believe this would be a good idea because it would give their lives some much needed order, purpose, and direction while making our country a better place at the same time. What are your opinions, if any on this?</span>