What are the dimensions of a one-man fighting position?

The dimensions of a one-man fighting position are defined to ensure that the marine can effectively use his equipment while remaining concealed and protected. The correct answer states that the fighting position should be shoulder wide, chest deep, and long enough to accommodate the use of an entrenching tool.

This configuration allows for adequate space to maneuver and dig effectively while maintaining a stable and secure placement for the marine. The shoulder-width ensures comfort and ease of entry and exit, preventing the position from being too restrictive. The chest depth provides enough cover from enemy fire while allowing the marine to engage in combat activities such as shooting or using weapons. Additionally, making the position long enough to utilize an entrenching tool is crucial since this tool is often used for digging or improving the defensive capabilities of the position.

The rationale behind these specific dimensions emphasizes both the practicality in combat situations and the need for sufficient cover and concealment, which are fundamental principles in combat readiness and survivability.