"... to have the opportunity to defend this great country whenever the president truly believes that our national security is threatened."
First off, the *opportunity* is already (always) there, compulsion is not opportunity.
But why does 0bama get to define "a national service obligation"? Why is he specified, not "the president", whoever is sitting in the chair? A committed Marxist is going to determine what future generations of Americans will be compelled to do as a condition of citizenry? I don't think so!
Exactly, this is a terrible bill to begin with, but then to give that power to one person is way too much.