Third Degree Communications
Why apply science to law enforcement critical incident response?
It seems law enforcement activities are under more scrutiny than ever before. During incident reviews and court trials, incident commanders are often forced to explain why they made certain decisions. Note that any law enforcement officer, even first arriving junior officers, may be the de facto "incident commander" until relived by a supervisor.
Other public safety professionals who make tough decisions, such as paramedics and hazardous materials technicians, rely heavily on the science of anatomy and chemistry (respectively) to guide their decision making. What science do we as law enforcement officers rely on? If you were being questioned by a grand jury about your decisions at a critical police incident, what science can you cite as the foundational rationale for why you did what you did?
According to Sid Heal, author of such renowned texts as "Field Command" and "Sound Doctrine: A Tactical Primer", tactical science is "the systematized body of knowledge covering the principles and doctrines associated with tactical operations or emergency responses and reconciling scientific knowledge with practical ends." 
Whether we give it a formal name like tactical science or not, the study and application of principles such as "defining the commander's intent" and "out maneuvering a suspect" are keys to success. Tactical science is not lofty academic theory, but rather well-established and sound principles to help guide our decision making.
Consider an incident commander leading an operation to apprehend a dangerous suspect who has fled into the neighborhoods. His decision making may have a range of consequences such as: allowing the suspect to escape and therefore endangering the public, inconveniencing citizens by closing down streets, and even costing his agency lots of overtime expenditures as he brings in additional resources. How does he decide what to do and can he later justify his decisions? Fortunately, the incident commander is well versed in tactical science and makes decisions based on sound principles. He knows statistically how fast a suspect will run and how to employ an envelopment tactic to catch him. He knows how to most efficiently employ his personnel so his impact to the public and overtime cost is only what is necessary. He clearly defines his "commander's intent" to his personnel who quickly implement his plan and apprehend the suspect. If asked to explain his decisions he can point back to current tactical science books and training courses as the basis for those decisions.
Understanding tactical science or becoming a tactician isn't just for those assigned to SWAT teams. Anyone who may find themselves being an incident commander, even for a short time, can benefit from a basic understanding. That understanding doesn't automatically come with being promoted or having time on the job. Instead it comes with years of experience, attending trainings and studying the relevant literature from the experts.
Scott Savage instructs the Third Degree Communications course entitled "Response Tactics for Critical Incidents and In-Progress Crimes".
 Charles "Sid" Heal, Field Command, (New York: Lantern Books, 2012), 11.