Military Diving Operations (MDO) is a single source, descriptive reference guide to ensure effective planning and integration of multi-Service operations. This multi-Service tactics, techniques, and procedures (MTTP) publication provides combatant command, joint force, joint task force (JTF), and operational staffs with a comprehensive resource for planning military diving operations It includes capabilities, limitations, and employment considerations. MDO describes United States (US) military dive mission areas (DMAs) as well as the force structure, equipment, and primary missions each Service could provide in support of joint operations. Commanders and staffs at all levels can use the MTTP to plan for employment of the capabilities of the US military dive forces in situations across the spectrum of dive operations. MDO is designed for planners at the tactical and operational level. It defines methods to ensure diving capabilities are integrated and provides quick reference charts on Service-specific dive team capabilities. MDO applies to commanders and planners at all levels across the Armed Services, to include US Army, US Air Force, US Marine Corps, US Navy, and US Coast Guard, who employ military dive forces when directing multi-Service and joint force operations. It is intended to be theater nonspecific and provides information extracted from existing Service directives, current lessons learned, and inputs from subject matter experts (SMEs).