The military designation of days and hours within the North Atlantic Treaty Organisation (NATO), is specified in -6 (STANAG 3680), NATO Glossary of Terms and Definitions, and marked (NATO) in what follows. Those entries marked (US) are specific to the U.S., and defined only in Joint Publication JP 1-02, Department of Defense Dictionary of Military and Associated Terms. (redundant acronym of day since the D stands for day, so it means day-day) (redundant acronym of hour since the H stands for hour so it means hour-hour)