Field Command is a first of its kind: a full-length tactical science textbook focused specifically on crisis situations faced by the law enforcement community. Expanding on the groundbreaking work done in Charles "Sid" Heal's Sound Doctrine: A Tactical Primer, the concepts and principles are taken from tactical texts and military field manuals, and are presented as close to how they are used in real-life situations as possible. Each section focuses on a discrete aspect of a tactical operation or disaster response, and is accompanied by illustrations that not only clarify the text but amplify it with new insights and applications. As American law enforcement adapts to the challenges of the 21st century, its heightened role in combatting terrorism, combined with the use of technological advancements, is at the forefront. In keeping with this new reality, Field Command provides an excellent resource for law enforcement officers, firefighters, private security, and other emergency responders in understanding the science that supports sound tactical decisions and planning.