Members of the Committee requested that GAO provide additional comments to a number of post-hearing questions after GAO testified before the Subcommittee on Management, Investigations, and Oversight on the Department of Homeland Security's (DHS) Preparedness for Catastrophic Disasters. The responses are generally based on work associated with previously issued GAO products, which were conducted in accordance with generally accepted government auditing standards. Because the responses are based on prior work, we did not obtain comments from DHS.