Nobel Prize-winning author John Steinbeck wears earphones as he rides in an Army helicopter on December 17, 1966 in Vietnam over the central Vietnamese Highlands. The 64-year-old author came to Vietnam to "go up the rivers and into the mountains" to see it for himself. Steinbeck began his first trip to visit combat units his first field trip to visit combat units the weekend of Dec. 16, 1966. (AP Photo)
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