What is a unique characteristic of a supplementary position?

A supplementary position is designed to serve a specific role in relation to a primary position, particularly when the primary position is unavailable. This means that the supplementary position provides an alternative means of maintaining tactical advantage or defense when the main position cannot be occupied for any reason, such as enemy fire or other tactical limitations.

This characteristic is essential for ensuring that Marines remain effective under changing battlefield conditions. By identifying and utilizing supplementary positions, units can maintain situational awareness, provide covering fire, or regroup, thereby enhancing their operational flexibility. The presence of a supplementary position ensures continuity in mission objectives, allowing forces to adapt and respond to enemy actions without losing the benefits of cover or concealment.

The other options do not accurately reflect the unique nature of a supplementary position. While a supplementary position may enhance a primary position in certain scenarios, enhancing alone does not capture the essence of its purpose. Similarly, while counter-surveillance is an important tactic within military operations, it does not define the primary function of supplementary positions. Lastly, the idea that supplementary positions are only used in training exercises is misleading because they are fundamental to real-world tactical operations as well.