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He was born in Fresno, California and attended Fresno grammar schools and high school. However, he spent much time skipping classes with his brother to engage in cowboy activities like trapping, branding, and shooting. Sam joined the Marines in 1943 and in 1945 his battalion was sent to China with the task of disarming Japanese soldiers and repatriating them. He left China in 1946. While his duty did not involve any combat situations, he claims to have witnessed acts of war between Chinese and Japanese soldiers. According to friends, these included several acts of torture and other atrocities against which the Americans were not permitted to intervene. It has been argued that at the time of his deployment to China the Second World War was over and so it is unlikely he could have seen this; but pockets of Japanese soldiers did still hold out against the Communist and Nationalist sides of the ongoing Chinese Civil War. This reportedly affected Peckinpah deeply and may have influenced his later depiction of violence in his films. After the war he attended college, earning a master's degree at University of Southern California in 1950. He was involved in stage work and theater productions before moving on to television.