I received an email yesterday from a friend who , as a quick side note , thanked me for doing my " military duty . " The truth is , I never did my " military duty . " My military duty was to defend my country . Instead , I spent five and a half years defending my government 's lunacy during the Viet Nam era .

Question: Why does the writer feel he did n't do his military duty ?
Answer: Because he was thanked through an email .None of the above choices .Because he does n't agree with the mission he was assigned to .Because he was in Vietnam .