7PM This episode's headline: Moving the Marines; Paul Nitze Interview; Third World Children and Hunger. The guests include In Washington: PAUL JUREIDINI, Political Military Expert; Amb. PAUL NITZE, U.S. INF Negotiator; In New York: Dr. RICHARD JOLLY, UNICEF. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; Reports from NewsHour Correspondents: CHARLAYNE HUNTER-GAULT, in New York; LESTER M. CRYSTAL, Executive Producer