Most overseas storage sites for US nuclear weapons, particularly in Europe, need substantial improvements in physical security measures and the personnel who guard the weapons, according to a newly available Air Force report. "Most sites require significant additional resources to meet DoD security requirements," according to the final report of the Air Force Blue Ribbon Review of Nuclear Weapons Policies and Procedures, completed in February. The report was made public last week by Hans M. Kristensen, director of the Nuclear Information Project at the Federation of American Scientists, who obtained it under a Freedom of Information Act request.