H-HOUR

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H-hour refers to the specific hour when a particular operation is scheduled to commence. It is most often used in military contexts and is defined as:

• Military Definition: The specific hour on D-day at which a particular operation commences. It can also refer to the seaborne assault landing hour.
• General Definition: The hour at which any major event planned for the future is set to begin.

H-Hour is part of a system of military designations used for planning operations:

• D-Day: The unnamed day on which operations commence or are scheduled to commence.
• H-hour: The specific hour on D-day at which a particular operation commences.

Historically, H-Hour is famously associated with the Normandy landings during World War II:

• H-Hour was at 6:30 a.m. local time on June 6, 1944.