H-hour Definition - MilitaryDictionary.org
1.) In amphibious operations, the time the first landing craft or amphibious vehicle of the waterborne wave lands or is scheduled to land on the beach, and in some cases, the commencement of countermine breaching operations.
2.) The specific hour on D-day at which a particular operation commences.
In the United States, military vocabulary is standardized by the Department of Defence. These terms are used by the United States Army, Navy, Air Force, and Marine Corps.
Term Classification: operations
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