Don't know about the choppers, but there was an unbelievable amount of shots fired at everyone else, LEO, rescue workers, Military, civies...
Tales of snipers shooting at helicopters and rescue personnel were among many reports of violence that swirled around New Orleans in the initial days after Katrina. Accounts of murders and rapes in the Superdome and convention center have since been called into question by state and local authorities.
Fog of disaster, Im not ready to give up my rights on hearsay. If someone says they saw it first hand, prove to me you were there. I've met too many Vietnam Seals in my lifetime to believe anyone without proof.
The military isn't trained to be a police force, so it should stick to the skills for which it is trained: surveillance, information gathering, especially logistical support. All of these activities are allowable under Posse Comitatus.
I left out it main purpose not by accident. They are not allowed under Posse Comitatus