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Circuit rebreathers are necessary equipment for divers during military diving. By sorting out foreign developments and applications of circuit rebreathers, this paper briefly compares and explains the types, principles, and characteristics of rebreathers, and introduces the rebreathers used by the United States Navy such as Oxygen closed-circuit rebreathers, semi-closed circuit rebreathers, and mixed-gas closed-circuit rebreathers. Combined with the training requirements of foreign rebreathers and the statistical data of diving accidents, this paper summarizes the selection criteria, training content, and training requirements for divers and analyzes the risk of rebreathers as a reference for equipment development and management.