This multiservice publication serves as a guide and a reference on the recognition and treatment of nuclear and radiological casualties. This publication classifies and describes potential nuclear and radiological threats and hazards. Further, this publication describes- - The biological aspects of blast, thermal radiation, and ionizing radiation and its effects on organs and systems of the body. - Procedures for first aid, medical diagnosis, personnel treatment, and management of nuclear and radiological casualties. - Effective communication when concerns are high and/or trust is low during a major radiation event. The material in this publication is applicable to both the nuclear environment and to other operations where high- or low-level radiation hazard exists; this includes Defense Support of Civil Authorities during weapons of mass destruction consequence management operations. The treatment modalities contained in this manual are based upon those described in the most recent North Atlantic Treaty Organization (NATO) Handbook on the Medical Aspects of Nuclear, Biological, and Chemical (NBC) Defensive Operations-AMedP-6(C) Volume I (Nuclear) and Volume II (Biological); Armed Forces Radiobiology Research Institute, Medical Management of Radiological Casualties Handbook; and the Defense Medical Materiel Program Office Treatment Briefs. Multiservice Tactics, Techniques, and Procedures for Treatment of Nuclear and Radiological Casualties May 2014 ATP 4-02.83 MCRP 4-11.1B NTRP 4-02.21 AFMAN 44-161(I)