War waged in self-defense, like a killing in self-defense, is perfectly moral.  In fact, it is a duty. 
This follows from the fact that since no one has the right to take innocent life, there is a correlative duty to defend it.  

You say you would not disarm the United States, but the next second you say something else, and call yourself a sinner for not disarming.  How silly.  Decide which it is you truly believe and have the courage of your convictions.  Something tells me you'd conclude it's not only ridiculous but ultimately un-Christian to disarm, knowing it will likely lead to the deaths of millions of innocents.     

As for Eisenhower:  He realized that the war machine can be an immensely immoral thing.  He did not, however, advocate disarmament.  Nor would any sane man.