Book excerpt: 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. It expands on the concepts laid out in 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 as possible. To facilitate understanding, illustrations are abundant and not only clarify the text but amplify it with new insights and applications.