O'Brien hated the war and thought it was wrong, and he often thought about fleeing to Canada. Unlike his fictional alter ego, however, he did not attempt it. Instead, O'Brien yielded to what he has described as a pressure from his community to let go of his convictions against the war and to participate — not only because he had to but also because it was his patriotic duty, a sentiment that he had learned from his community and parents who met in the Navy during World War II. "It's not Worthington I object to, it's the kind of place it is," O'Brien told an interviewer. "The not knowing anything and not tolerating any dissent, that's what gets to me. These people sent me to Vietnam, and they didn't know the first thing about it."
O'Brien ultimately answered the call of the draft on August 14, 1968 and was sent to Army basic training at Fort Lewis, Washington. He was later assigned to advanced individual training and soon found himself in Vietnam, assigned to Firebase LZ Gator, south of Chu Lai. (The appendix of this book includes a map of Vietnam, including areas referred to in the novel.) O'Brien served a 13-month tour in-country from 1969 to 1970 with Alpha Company, the Fifth Battalion of the 46th Infantry, 198th Infantry Brigade, Americal Division. He was a regular foot soldier, or, as commonly referred to in veterans' slang, a "grunt," serving in such roles as rifleman and radio telephone operator (RTO). He was wounded twice while in service and was relatively safe during the final months of his tour when he was assigned to jobs in the rear. O'Brien ultimately rose to the rank of sergeant.
After returning from his tour in March 1970, O'Brien resumed his schooling and began graduate work in government and political science at Harvard University, where he stayed for nearly five years but did not complete a dissertation.
