I have always liked "The End." It seems to be about the November 1, 1963 coup d'etat in South Vietnam. In the song's lyrics, I discern references to major players in the event including Ngo Dinh Diem, Duong Van Minh and Tran Le Xuan as well as the the Southeast Asia Treaty Organization, the Warsaw Pact, and the US State Department.
However, I may be the only one who has ever come up with this interpretation.
I always thought it referred to a battle/apocalyptic event somewhere in the far east-mostly because that was what I was told by my cousins and friends who served in Nam-it does make sense...