1. Which war is O'Brien describing?
He is describing the Vietnam War.
2. What are the causes and consequences of this war?
The causes of the War are the subsequent war itself were classic symptoms, components and consequences of the Cold War. The causes of the Vietnam War revolve around the simple belief held by America that communism was threatening to expand all over south-east Asia.
The Vietnam War cost the American 58,000 deaths and 350,000 injured and also 2 million Vietnamese dead. The War also cause Congress enacted the War Powers Act in 1973, requiring the president to receive explicit Congressional approval before committing American forces overseas.
3. In this story, is O'Brien for or against the war? What about the other soldiers in his platoon?
He is against the War. Other soldiers are also against the War.