H-hour
Operation's starting point
H-hour is the specific time designated for a military operation to begin—the moment when coordinated action commences.
Like D-day (which marks the date), H-hour allows planners to synchronize complex operations without revealing actual times in advance: The assault begins at H-hour.
The term extends to any precisely scheduled start time for a major undertaking.
Violent offensive act
- objectivePurpose or goal
- deploymentOrganized distribution of resources
- troopsMilitary personnel collectively
- missionPurpose-driven task
forces · engagement · briefing · readiness · command · offensive · operation · attack
Backward enumeration to zero
- deadlineTime limit for completion
- launchSet into motion
- timetableArranged list of events
- synchronizationAligning timing across systems
coordination · designated · precise · scheduled · appointed · simultaneous · signal · watches
Northern French coastal region
- invasionForcible entry into territory
- AlliesWWII's victorious coalition
- landingDescent's final moment
- beachesSandy coastal areas
Omaha · Utah · Gold · Juno · Operation Overlord · liberation · amphibious · beachhead
assault
Violent offensive act
- objectivePurpose or goal
- deploymentOrganized distribution of resources
- troopsMilitary personnel collectively
mission · forces · engagement · briefing · readiness · command · offensive · operation · attack · advance
countdown
Backward enumeration to zero
synchronization · coordination · designated · precise · scheduled · appointed · simultaneous · signal · watches · timing
Normandy
Northern French coastal region
beaches · Omaha · Utah · Gold · Juno · Operation Overlord · liberation · amphibious · beachhead · 1944
- D-DayD-Day, Normandy, Omaha Beach, Utah Beach, Gold Beach
H-hourestimate
Informed guess at quantity
approximation · rough estimate · TBD · open-ended · unscheduled
H-hourceasefire
Agreed halt to fighting
stand-down · mission complete · armistice · all-clear · withdrawal
H-hourabort
End before completion
stand-down · no-go · cancellation · scrubbed · called off