Here's a piece from the New York Times:
http://www.nytimes.com/2005/09/09/nation...agewanted=printAs New Orleans descended into chaos last week and Louisiana's governor asked for 40,000 soldiers, President Bush's senior advisers debated whether the president should speed the arrival of active-duty troops by seizing control of the hurricane relief mission from the governor.
For reasons of practicality and politics, officials at the Justice Department and the Pentagon, and then at the White House, decided not to urge Mr. Bush to take command of the effort. Instead, the Washington officials decided to rely on the growing number of National Guard personnel flowing into Louisiana, who were under Gov. Kathleen Babineaux Blanco's control.
This is backed up by the Wall Street Journal:
http://www.opinionjournal.com/columnists/dhenninger/?id=110007230Before the hurricane arrived in New Orleans, Adm. Keating approved the use of the bases in Meridien, Miss., and Barksdale, La., to position emergency meals and some medical equipment; eventually the number of emergency-use bases grew to six. And before landfall, Adm. Keating sent military officers to Mississippi and Louisiana to set up traditional coordination with their counterparts from the Federal Emergency Management Agency. As well, Deputy Defense Secretary Gordon England ordered the movement of ships into the Gulf.
By the Pentagon's account, it carried out these preparations without any formal Katrina-related request from FEMA or other authorities. The personnel behind the massive military effort now on display in Louisiana--airlift evacuation, medical, supply, and the National Guard--was on alert a week before the hurricane. According to Assistant Secretary McHale, "The U.S. military has never deployed a larger, better-resourced civil support capability so rapidly in the history of our country."
So where were they on the two days of globally televised horror? Why, for instance, didn't DoD fly all this help close to New Orleans as soon as it saw Katrina coming? The answer, in military argot, is that you don't deploy troops beneath a bombing run; Katrina predictably would have wiped out any help put in her uncertain path, just as she rolled over the Big Easy's wholly unprotected "first responders."