The anti-war sentiment of the film is most clearly expressed here. Heavily edited in film. In screenplay more detail given. CT comes closer to E's position. E confesses that he believed in war in 1965 but now believes US will lose the war.
War is wrong.
Tells CT that the only decent thing to come out of the war is that people like him will know how horrible war is and will oppose future wars and glorification of war. The apocalyptic ending of the film with the captain ordering an airstrike on their own position.