Answer:
He is a journalist who believes in the United States government’s intentions in Vietnam.
Step-by-step explanation:
Neil Sheehan came back to the United States after covering the war in Vietnam. In this excerpt he makes it clear he is a journalist when he says: "....the journalist’s visa I had hurriedly obtained ..". Then, he defends the US policies in Vietnam. He backs these policies - mainly related to economic amd military issues- for he thinks that they will prevent the Communist Pary from taking over in Vietnam.