Technical Manual (TM) 3-34.83 Engineer Diving Operations provides the doctrinal basis and the responsibilities, relationships, procedures, capabilities, constraints, and planning considerations for the conduct of engineer underwater operations throughout an area of operations (AO). Its primary purpose is to integrate engineer underwater operations into the overall sustainment and mobility engineering structure. The doctrine presented is applicable for joint interagency and multinational environments in full spectrum operations. This publication applies to the Active Army, the Army National Guard (ARNG)/the Army National Guard of the United States (ARNGUS), and the United States Army Reserve (USAR) unless other stated. Terms that have joint or Army definitions are identified in both the glossary and the text. Glossary references: The glossary lists most terms used in TM 3-34.83 that have joint or Army definitions. Terms with an asterisk in the glossary indicate that this manual is the proponent TM (the authority). Text references: Definitions printed in boldface in the text indicate that this manual is the proponent. These terms and their definitions will be incorporated into the next revision of Field Manual (FM) 1-02/Marine Corps Reference Publication (MCRP) 5- 12A. For other definitions in the text, the term is italicized, and the number of the proponent FM follows the definition. The proponent for this publication is the United States Army Training and Doctrine Command (TRADOC).