A tour bus takes staff members of the United States publication "Navy News This Week" on a tour of a Polish city. The magazine staffers are visiting Poland during a tour by officers and crew of the guided missile cruiser USS HARRY E. YARNELL (CG 17) and the guided missile frigate USS KAUFFMAN (FFG 59). The ships are visiting Poland in conjunction with BALTOPS '90, a NATO exercise in the Baltic Sea, and their port call represents the first visit by United States Navy vessels since 1927