What is the term for the point where the platoon crosses the LD and begins movement along the direction of attack?

The correct term for the point where the platoon crosses the Line of Departure (LD) and begins movement along the direction of attack is referred to as the Line of Departure. This is the designated point in military operations that marks the boundary between the last friendly unit and the enemy area. It signifies the start of the offensive action and is crucial for coordinating the movement of troops and ensuring that all forces are synchronized for the attack.

Understanding the term's significance helps differentiate it from other concepts in military operations. The Point of Arrival typically refers to a designated finish line or objective point that units aim to reach during their mission. The Point of Departure is often associated with the starting location for a movement but does not denote the actual crossing into hostile territory, while an Assembly Area is used for organizing and staging units before they enter combat. Each of these terms serves a unique purpose in military doctrine, with the Line of Departure specifically marking the transition from preparation to action.