What are you saying here?  The US military kills innocents and thus has moral people deliving?

US soldiers are professionals.  They are not conscripts (yet), so they are not forced to kill people.   If you object to killing a human, you can be reassigned to a role that does not involve that.  Then you can quit when your tour of duty is over. 

Still, it is a lot of death.  Not unnecessary though, as unchecked aggression does not stop.