It was my task to set up the perimeter and make sure the area was locked down. As other tasks were being identified, I observed several sergeants disappear into the background instead of volunteering. They missed a wonderful opportunity to prove themselves. To be effective in a chaotic environment, you must learn to minimize the impact, stress the importance of communication, and stay positive.
The first step in dealing with chaos is preventive; you must learn to minimize the impact before it ever starts. You accomplish this by preparing yourself and members of your command by conducting relevant training. Though hands-on training is always considered best, notional (on paper) training through tabletop exercises or squad/platoon assignments is also effective.
One example comes from former New York City mayor Rudy Giuliani. In his book on leadership he tells of how he and his multiagency command staff routinely conducted tabletop exercises. One such exercise involved a small plane crashing into the Twin Towers. Though the incident was not of the same magnitude as the 9/11 attack, it did give the incident command a chance to work through many of the same issues they would face on that fateful day.
What makes chaos so difficult is that it tends to create new circumstances and new scenarios, or simply overwhelms you by giving you so much to deal with at one time. The goal of your training is to take the unfamiliar and make it as familiar as possible. Work toward making each situation a set of prioritized tasks that can be managed efficiently. Since all critical incidents share the same baseline response, create a flexible structure, stick to the basics, and train often. That way you will be way ahead of the game when game day comes.
Through good communication, supervisors can clearly assess and identify the problem. When you know what you're up against, you can begin to take actions that have the highest probability of success. Supervisors need to ask questions, seek confirmation of critical information, and seek input whenever possible.