Hurricane Katrina was one of the largest natural disasters in U.S. history. Despite a large deployment of resources at all levels, many have regarded the fed. response as inadequate. The GAO has a body of ongoing work that covers the fed. govt.'s preparedness & response to hurricanes Katrina & Rita. This review examined: (1) the extent to which pre-Katrina plans & training exercises reflected the military assistance that might be required during a catastrophic, domestic, natural disaster; (2) the military support provided in response to Katrina & factors that affected that response; & (3) the actions the military is taking to address lessons learned from Katrina & to prepare for the next catastrophe. Includes recommendations. Illustrations.