This episode's headline: Catastrophic Costs; Iraq-Iran: The War Without End; Fleet Moves; Final Briefing. The guests include In Washington: Dr. OTIS BOWEN, Secretary of Health; STUART BUTLER, Heritage Foundation; ROBERT BALL, Former Social Security Commissioner; WILLIAM BEECHER, Boston Globe; LARRY SPEAKES, White House Spokesman; REPORTS FROM NEWSHOUR CORRESPONDENTS: MICHAEL BUERK (BBC), in South Africa; DON MURRAY (CBC), in Iran. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JUDY WOODRUFF, Correspondent