Definition
The point or line where attacking forces cross from planning into execution, leaving behind safety and entering the danger zone. Once you cross LD, there's no pretending this is still just an exercise.
Example Usage
All units cross the line of departure at H-hour 0600—weapons tight until we make contact.
Origin
Military operational planning terminology from early 20th century combined arms doctrine
Fun Fact
Often abbreviated 'LD' in operations orders, paired with 'LD/LC' (Line of Departure/Line of Contact) for the full bracketing of when your peaceful morning becomes decidedly less peaceful.
Source: Army offensive operations doctrine FM 3-90
Related Terms
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See “line of departure” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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