Line of Departure
Encyclopedia
Line of Departure is a military term used to denote the starting position for an attack on enemy positions. During the Second World War
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, the term in use in the British, Canadian and American militaries was Start Line. Line of Departure (LD) was adopted some time after the Korean War
Korean War
The Korean War was a conventional war between South Korea, supported by the United Nations, and North Korea, supported by the People's Republic of China , with military material aid from the Soviet Union...

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Strictly speaking, the line of departure is the point at which the attacking element crosses from friendly-held ground into unsecured ground. This is not to be confused with an Assembly Area (AA), which is the secure area in which the attacking force prepares for an attack. Once ready, the force leaves the assembly area, may conduct a passage of lines, and crosses the line of departure.
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