What is an "assault echelon"?

An "assault echelon" refers to the segment of the landing force that is positioned at the forefront of an amphibious operation. This unit's primary role is to initiate the assault and establish a secure beachhead, which is critical for the success of the operation. The assault echelon comprises frontline troops and equipment that engage in direct combat against enemy forces upon landing. Their objective is to quickly secure a foothold, allowing additional forces and supplies to land and support the operation’s wider objectives.

In contrast, the other choices describe different aspects of military operations. The rear support units are crucial for logistics and supply but do not engage directly in the initial assault. The command structure pertains to leadership and decision-making rather than the frontline action. Reserve forces, while essential for reinforcement and follow-up operations, do not take part in the immediate assault. Thus, identifying the assault echelon as the forefront of the landing force underscores its vital role in achieving the operational success during an amphibious assault.