Which of the following best describes tactics in military doctrine?

Tactics in military doctrine primarily relate to the ordered placement and maneuver of units in the field to achieve specific objectives. This aspect emphasizes how forces interact with one another and adjust to the dynamics of the battlefield. Tactical operations are adaptable and require a keen understanding of the current situation, the terrain, and the enemy forces. Hence, the ability to apply tactical principles effectively can lead to decisive action and operational success.

In this context, the other options do not accurately capture the essence of tactics. Non-prescriptive methods would suggest a lack of structure or guidance, which contradicts the systematic nature of military tactics. Designing tactics solely by high command, without field input, would overlook the invaluable insights and experiences of those engaged directly in combat situations. Lastly, a fixed protocol implies rigidity, whereas tactics must be flexible and responsive to the evolving conditions of warfare. This adaptability is vital for military success, distinguishing tactics from strategic or operational planning, which may utilize broader guidelines.