This publication, "Multiservice Tactics, Techniques, and Procedures for Health Service Support in a Chemical, Biological, Radiological, and Nuclear Environment (FM 4-02.7)," establishes doctrinal multiservice tactics, techniques, and procedures (MTTPs) for health service support (HSS) units operating in a chemical, biological, radiological, and nuclear (CBRN) and toxic industrial material (TIM) environment. It is the intent of this document to inform the combatant commanders (CCDRs), joint force commanders (JFCs), joint force medical commanders and medical planners, and component commanders and their staffs on the tools available to provide the best quality of force health protection (FHP) and HSS in a CBRN environment to enhance mission success. This publication bridges the gaps between Service and joint HSS publications. This publication provides information for use by the component commanders and their staffs, command surgeons, medical planners, and individuals responsible for FHP and HSS in a CBRN environment. Commanders have the direct responsibility for protecting their forces within a CBRN environment. On future battlefields, failure to properly plan and execute CBRN defensive operations may result in significant casualties, disruption of operations, and even mission degradation. Further, the commander's mission and execution plans must address the implications of HSS in a CBRN environment. This publication contains MTTPs relative to HSS in the following specific areas: Chemical, biological, radiological, and nuclear aspect of HSS, Casualty prevention, Casualty care and management, Patient movement, Patient decontamination, Veterinary service support and food and water safety, Medical laboratory support, Combat and operational stress control (COSC), Health service logistic (HSL) support (HSLS), Homeland defense, Individual and collective protection systems.