I have actually read 1984, several times in fact. And I know that Diamond Dogs was comprise largley of songs which Bowie intended to be used in a musical of 1984. But I never got a terrible feeling whilst reading 1984 or listening to the album, its just another way of life and an ultimate religion. Though there was war in 1984 it was only a minor theme of the novel used only to show how little people knew of the truth as Winston thought that the war was most likely made up. So I dont see how Diamond Dogs is anti-war.
"In the 14-18 war I went to sea" ---(In the 14-18 war there was not a navy)
And we can force you to be free.