This episode's headline: Bracing for Combat; Serbian View; Open Secrets; Budgeting for the Future. ANCHOR: JIM LEHRER; GUESTS: PRESIDENT CLINTON; VLADISLAV JOVANOVIC, UN Ambassador, Yugoslavia; LEE CULLUM, Dallas Morning News; CYNTHIA TUCKER, Atlanta Constitution; ROBERT KITTLE, San Diego Union Tribune; BETH BARBER, Cleveland Plain Dealer; TOM BRAY, Detroit News; JACK LEW, White House Budget Director; SEN. PETE DOMENICI, Chairman, Budget Committee; CORRESPONDENTS: PHIL PONCE; MARGARET WARNER; KWAME HOLMAN; LEE HOCHBERG; ELIZABETH FARNSWORTH