Pentagon's rapid-reaction unit will include specialists in chemical, biological and nuclear attacks, logistical, medical and transport

The brigade-sized unit of about 4,000 will be composed of specialized military personnel from bases across the country who will deploy on a moment's notice to assist civilian authorities. Created by the U.S. Northern Command, which itself came into being after the 9/11 attacks, the unit will include specialists in handling chemical, biological and nuclear attacks, as well as those with logistical, medical and transport expertise.The timing of the 'standup' of the unit is significant, given the nervousness that will accompany the first change in presidential administrations since the attacks.