We know more about war than we know about peace, more about killing than we know about living. We have grasped the mystery of the atom and rejected the Sermon on the Mount. If you are going to try to go to war, or to prepare for war, in a capitalist country, you have got to let business make money out of the process or business won't work. In time of war the first casualty is truth. Only the defeated and deserters go to war.
All diplomacy is a continuation of war by other means.
The more you sweat in peace, the less you bleed in war. The art of war is simple enough. Find out where your enemy is. Get at him as soon as you can. Strike him as hard as you can and as often as you can, and keep moving on.