There is a ship there, and it's helicopter was shot at while trying to evacuate those with medical needs.
http://72.14.207.104/search?q=cache:HKRxCbyW0T4J:www.cnn.com/2005/WEATHER/08/30/katrina.recovery/+hospital+Comfort+heads+to+New+Orleans&hl=en
"The Navy said the amphibious assault ship USS Bataan was off the Louisiana coast and that its helicopters were already flying relief missions.
The ship, which resembles a small aircraft carrier, can produce large quantities of fresh water and is equipped with 600 hospital beds."