There are many people and agencies to blame for the total cluster-fuck that is the Katrina aftermath. The Mayor of New Orleans is to blame along with the people who voted for him, The Governor of Louisiana, George Bush, Bill Clinton, Past Mayors, Governors and Presidents along with both Democrats and Republicans in Congress who parities have both had control of congress at times over the past 40 years and the people who voted them in office.
There is plenty of blame to go around, but spending our time finding the person(s) who fucked up won't fix anything.
We know who fucked up. We did. We put incompetent, distracted, indifferent and corrupt people in positions of power and responsibility, then when things go to shit, we expected them to become competent, focused, concerned and honest when needed. That was our fault.
Since this Hurricane and the resulting fuel shortages will cause a recession next year, it is almost certain that the Army, Navy, and Marines will be able to meet their enlistment quotas.