Look it up.
Among other things, Butler was only one of 19 people ever awarded the Medal of Honor twice and the only person to be awarded a Marine Corps Brevet Medal and a Medal of Honor for two different actions.
After it dawned on him how his heroism and the heroism of the troops under his command had been misused, he wrote a book called "War is a Racket" which I can virtually guarantee you never heard about in school.
Butler concluded there are only two reasons to ever take up arms:
1. To defend the country against real - not manufactured - attacks
2. To defend the Bill of Rights