Smedley Butler 
War is a Racket [EPUB ebook] 

War Is a Racket is a speech and a 1935 short book, by Smedley D. Butler, a retired United States Marine Corps Major General and two-time Medal of Honor recipient. Based on his career military experience, Butler frankly discusses how business interests commercially benefit (including war profiteering) from warfare. He had been appointed commanding officer of the Gendarmerie during the United States occupation of Haiti, which lasted from 1915 to 1934.