Sheepdog Tip of the Day, Before Combat tip 135
The three major psychological processes at work in enabling violence are classical conditioning (a la Pavlov's dog), operant conditioning (a la B. F. Skinner's rats), and the observation and imitation of vicarious role models in social learning.
Lt. Col. Dave Grossman, On Killing
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Bullet Proof Mind for the Armed Citizen Seminar
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Additional Resources
For PTSD, Shepherd Resource Group.