Mankind must put an end to war, or war will put an end to mankind." - John Fitzgerald Kennedy 

"The military don't start wars. Politicians start wars." - William Westmoreland Jr

"You can no more win a war than you can win an earthquake." - Jeannette Rankin 

"Either war is obsolete or men are." - R Buckminster Fuller 

"Older men declare war. But it's the youth who must fight and die! " - Herbert Hoover 

"The pioneers of a warless world are the youth that refuse military service. ." - Albert Einstein 

"Violence is the first refuge of the incompetent." - Issac Asimov