Definition
The specific hour on D-Day when an operation begins, the synchronized moment when everyone stops planning and starts executing. The military's equivalent of "go time" but with more precision and consequences.
Example Usage
H-Hour is 0430—all elements will cross the line of departure simultaneously regardless of earlier delays.
Origin
Military planning terminology, early 20th century
Fun Fact
If D-Day is June 6, H-Hour might be 0630—but if the operation delays, D-Day becomes D+1 while H-Hour stays the same, creating timeline math that confuses historians and veterans alike.
Source: Military operations planning and order formats
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