Dr. James S. Williams is an emergency, trauma, and critical-care physician, tactical medical professional, firearms instructor, and the creator of the Tactical Anatomy concept and Shooting With X-Ray Vision training system.
Professional Biography
Williams developed Tactical Anatomy from decades of clinical work treating traumatic injuries, long association with law enforcement, service as a police medical officer and SWAT medic, firearms training, hunting experience, and study of terminal ballistics and officer-involved shootings.
He began formally teaching the curriculum in the early 2000s to law-enforcement officers, military personnel, firearms instructors, and armed citizens in the United States and abroad. His professional teaching has included work with the International Law Enforcement Educators and Trainers Association and the International Association of Law Enforcement Firearms Instructors.
Tactical Anatomy
Williams challenged the limitations of conventional silhouette targets and generalized instructions to aim at “center mass.” A paper target is flat, while the human body contains bones, organs, blood vessels, the airway, spinal structures, and other tissues arranged in three dimensions.
The apparent location of those structures changes as a person turns, bends, or presents at a different angle. Tactical Anatomy teaches students to visualize critical anatomical structures in three dimensions and understand the path required to reach them from the shooter’s perspective.
This does not replace legal judgment or marksmanship. It adds anatomical knowledge to a decision that has already met the lawful threshold for deadly force, helping the practitioner understand what the sights represent beyond a two-dimensional scoring zone.
Shooting With X-Ray Vision
Williams named his primary curriculum Shooting With X-Ray Vision to describe the mental model students are expected to develop. The practitioner cannot literally see through a person, but can learn enough anatomy to estimate where important structures lie from a particular angle.
His instructor program created a way for qualified firearms instructors to carry these concepts into their own agencies and training organizations. That instructor-development component helped Tactical Anatomy concepts spread beyond the students Williams could teach directly.
Medicine and Terminal Ballistics
Williams’s medical experience exposed him to serious injury, acute physiological failure, and gunshot wounds. Clinical work allowed him to compare assumptions from firearms training with the variable consequences observed in trauma patients.
His approach emphasizes that handgun projectiles generally produce useful effects through adequate penetration and damage to important anatomical structures. Ballistic gelatin can model aspects of projectile behavior in soft tissue, but it cannot reproduce the complete human body. Tactical Anatomy addresses the additional question of what structures a projectile is likely to encounter along its path.
Williams has also drawn from hunting and direct examination of wound paths. Those observations supplement rather than replace medical research, providing another opportunity to compare projectile paths with intact anatomy.
Law-Enforcement and Tactical Medicine
Williams served as Medical Officer for the Waupaca County Sheriff’s Office in Wisconsin and worked as a SWAT medic. That experience connected emergency medical knowledge with the operational environment, communications, equipment, movement, and time pressures surrounding tactical incidents.
His work brings together medicine, terminal ballistics, firearms instruction, legal and ethical decision-making, and three-dimensional target visualization into a unified educational framework.
P&S Connection
Williams is included in the Extended Primary & Secondary Network as a medical, tactical, ballistics, and firearms-training resource. His work supports P&S discussions of anatomy, projectile effects, shot placement, training targets, and the limits of simplified ideas about handgun effectiveness.
Key Areas of Experience
- Emergency, trauma, and critical-care medicine
- Tactical medicine and SWAT medical support
- Tactical Anatomy
- Shooting With X-Ray Vision instructor development
- Human anatomy and physiology
- Terminal ballistics and projectile injury
- Three-dimensional target visualization
- Law-enforcement firearms instruction
- Deadly-force education and ethics
- Knowledge preservation and instructor development
Selected Sources
Profile last reviewed: September 11, 2026.
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James S. Williams MD · Tactical Anatomy Systems · Tactical Anatomy · Shooting With X-Ray Vision · SXRV · trauma physician · tactical medical officer · SWAT medic · terminal ballistics · three-dimensional target visualization · IALEFI · ILEETA · Extended P&S Network