Which of the following is NOT a principle of obstacle employment?

The principle of "Strategically deployed" is not specifically categorized as a principle of obstacle employment. Obstacle employment is typically concerned with how obstacles are used in the field to enhance defensive capabilities, manage enemy movement, and integrate with overall tactics.

The concept of being covered by fire refers to the need for obstacles to be interlinked with fire support, creating a cohesive defense that hampers enemy movement while being exposed to friendly fire. Being integrated with existing or other obstacles speaks to the importance of creating a seamless defense, ensuring obstacles work in conjunction with each other for maximum effectiveness. The principle of being protected by early warning devices underscores the need for enhancing security around obstacles, allowing forces to detect enemy activity and respond effectively.

In contrast, "Strategically deployed" does not fit within the core principles of obstacle employment, which focus more on operational integration, mutual support, and enhancing defensive capabilities rather than the broader strategic deployment of the obstacles themselves. This makes it the correct choice for what does not belong to the established principles of obstacle employment.