I agree, with reference to your last point.
I agree. But that's not really ever going to change. Firstly the rich and successful are already employed (with the exception of our old officer class), and secondly the poor are simply better soldiers. They are tougher, more resourceful, and more used to people being mean to them. Combat useful skills.
I agree up to a point. but soldiering cannot be a matter of personal whim on the day. Nonetheless your basic point is merely echoing Gen. Mike Jackson. he argued society was ignoring its obligations to its defenders viz housing, healthcare, and recognition.
As I said in point one, society has a great many needs unrelated to warfare. Moreover, not every immgrant would make a good soldier.