The recent string of hurricanes and other tropical storms caused a massive amount of destruction and disruption that is severely affecting millions of people across thousands of square miles. The rescue and recovery efforts need to match that immense scale in order to effectively restore the situation. More than twenty thousand federal employees are currently providing assistance in the Caribbean islands alone.
Multi hazard events like a tropical storm require a large amount of resources of wildly varying types, and everything from the generators brought in to non-powered areas, to the relief supply lines need to be protected from thieves and criminals, many who are now in more desperate circumstances than they have previously experienced. Handling this task is possibly the most effective security organization in existence - the U.S. Military.
More than 30,000 members of the National Guard were considered for deployment before the first storm struck, and with contributions from all other branches of service they have taken up the majority of security operations in the disaster areas. This in addition to their well-publicized relief and rescue efforts. The military is understandably quiet on the details of an active defense operation, the enormity of their effort should not be overlooked.