On Killing: The Psychological Cost of Learning to Kill in War and Society is a book by Dave Grossman exploring the psychology of the act of killing and the military law enforcement establishments attempt to understand and deal with the consequences of killing. The book is based on S.L.A. Marshall's theory that the majority of soldiers in war do not ever fire their weapons due to an innate resistance to killing.
Overview
The book is based on S.L.A. Marshall's studies from World War II, which proposed that, contrary to popular perception, the majority of soldiers in war do not ever fire their weapons because of innate resistance to killing. Based on Marshall's studies, the military instituted training measures to break down this resistance, raising soldiers' firing rates to over 90 percent during the Vietnam War.
Grossman points out that there are great psychological costs that weigh heavily on the combat soldier or police officer who kill if they are not mentally prepared for what may happen; if their actions (killing) are not supported by their commanders and/or peers; and if they are unable to justify their actions (or if no one else justifies the actions for them).
The second edition of the book, along with an audio version, was released in 2009.
The soldier's choice
Grossman claims in his book On Killing that soldiers are faced with four options once they have entered into combat. Fight: As the name implies, this is the standard that defines the soldier's role as actively trying to defeat the enemy by use of their training. Flight: This option involves the combatant fleeing the engagement. Posture: This action involves the soldier falsely showing active participation in combat. In actuality they are not being effective in deterring the enemy from success. This is a major point of concern for commanders as it is difficult to tell the difference between a soldier posturing or fighting. Submit: Submission to the enemy during an engagement is a direct act of surrender. In the animal kingdom, this is used by lesser combatants to avoid being injured upon ascertaining the futility of the battle.
The problem of non- or miss-firing soldiers
S.L.A. Marshall did a study on the firing rates of soldiers in World War II. He found that the ratio of rounds fired vs. hits was low; he also noted that the majority of soldiers were not aiming to hit their targets. This is attributable to the inherent humanity inside the soldiers who grew up in a peaceful, equitable society. This was a problem for the US military and its allies during World War II. New training was developed and hit rates improved. The changes were small, but effective. First, instead of shooting at bull's-eye type targets, the United States Army switched to silhouette targets that mimic an average human. Training also switched from 300 yard slow fire testing to rapid fire testing with different time and distance intervals from 20 to 300 yards. With these two changes, hitting targets became a reaction that was almost automatic.
Some authors have discredited S.L.A. Marshall's book, stating that the book may be more of an idea of what was occurring and not a scientific study of what was happening. Other historians and journalists have outright accused Marshall of fabricating his study.
Another important factor that increased fire and hit rates is the development of camaraderie in training. Soldiers are taught that their actions do not only help or harm themselves, but the whole unit. This recurring theme in recollections collected from war veterans is the idea that they were not fighting for themselves at the time but more concerned for the people to their left and right. This ideology is ancient, recorded for example by Sun Tzu in his book The Art of War: "If those who are sent to draw water begin by drinking themselves, the army is suffering from thirst."
Increase in PTSD since World War II
Some research indicates that the increased incidence of post-traumatic stress disorder (PTSD) in the military is related to the increase in firing rates. This brings up the classic debate of correlation vs. causation. Many believe that other factors have been influencing PTSD such as decompression time after conflicts, and the lack of moral sovereignty in engagements.