Throughout the history of diving, each of the five United States Armed Services has evolved its diving capabilities to meet the demands of Service-specific mission requirements. Their divers have specialized training, equipment, and capabilities based on those Service-specific missions. These dive capabilities are detailed in appendices B through G. The Military Diving Operations (MDO) MTTP publication is designed to assist commanders and planning staffs who require dive operations capability. It provides considerations for immediate response as well as deliberate planning for situations requiring dive capabilities. It describes the 13 dive mission areas (DMAs) performed by military divers, describes the 13 different types of military divers within the Services, and lists associated capabilities and limitations for the types of divers.