Fundamentally only two great novelties have come out of recent warfare. They are: (1) mechanical vehicles, which relieve the Soldier of equipment hitherto carried by him; (2) air supply, which relieves the vehicle of the road.
Samuel Lyman Atwood MarshallStudies by Medical Corps psychiatrists of combat fatigue cases... found that fear of killing, rather than fear of being killed, was the most common cause of battle failure, and that fear of failure ran a strong second.
Samuel Lyman Atwood MarshallThe far object of a training system is to prepare the combat officer mentally so that he can cope with the unusual and unexpected as if it were the altogether normal and give him poise in a situation where all else is in disequilibrium.
Samuel Lyman Atwood Marshall