AMHERST, Mass. - A pair of top-ranking U.S. Navy anti-terrorism experts will give a guest lecture on Thurs., Oct. 31 from 1-2:15 p.m. in the Student Union Ballroom at the University of Massachusetts Amherst. The speakers, Rear Admiral Donald Arthur, former Deputy Surgeon General, U.S. Navy, and Commander Mary Chaffee, Deputy Director for the U.S. Navy Office of Homeland Security and a 1983 UMass graduate, are giving the talk as part of a new joint course, "Terrorism – Ready?" offered by the School of Public Health and Health Sciences and the School of Nursing. The talk is free and open to the public.