There's a book on this called On Killing by David Grossman.[1] "In World War II, only 15 to 20 percent of combat infantry were willing to fire their rifles. In

There's a book on this called On Killing by David Grossman.[1] "In World War II, only 15 to 20 percent of combat infantry were willing to fire their rifles. In Korea, about 50 percent. In Vietnam, the figure rose to more than 90 percent." [1] - https://www.amazon.com/Killing-Psychological-Cost-Learning-Society/dp/0316040932 https://www.amazon.com/Killing-Psychological-Cost-Learning-S...