"No source, however, captures the war hates and war crimes of this merciless struggle more soberly than Charles Lindbergh's diary. For over four months in mid-1944, Lindbergh lived and flew as a civilian observer with U.S. forces based in New Guinea, and as the weeks passed he became deeply troubled, not by the willingness to kill on the part of the soldiers, which he accepted as an inherent part of the war, but by the utter contempt in which Allied fighting men held their Japanese adversaries. The famous "Lone Eagle," whose isolationist sentiments had placed him among the conservative opponents of President Roosevelt's policies, really hearkened back to what [J. Glenn Gray] has called the more chivalrous tradition of the professional militarist, who accepts the necessity of war while maintaining respect for his adversaries, recognizing courage as courage and duty as duty, irrespective of the uniform worn. Lindbergh found no such sentiments among the Allied forces in the Pacific, where officers and enlisted men alike saw the enemy simply as animals and "yellow sons of bitches," and his detailed journal may be the most forthright firsthand account available of the "other" side of the Pacific War."
January 1, 1970
https://en.wikiquote.org/wiki/Charles_Lindbergh