Final answer:
The coordination of sector overlaps in military operations is generally the responsibility of military planners or officers. This ensures thorough surveillance or defense coverage. The concept of scanning overlap in a cosmic context faces challenges from the vast distances involved and potential time delays.
Step-by-step explanation:
The question 'Who ensures the sectors they scan "overlap" those that have already been scanned or "overlap" those of the soldiers that are scanning?' refers to coordination within a military body during strategic operations. Coordination is crucial in both military sectors and in the effort to monitor vast areas like a galaxy for signals of other civilizations. In military operations, strategic planning involves ensuring sector overlap to maintain a thorough and continuous coverage for surveillance or defense. This typically falls under the responsibility of military planners or officers who design operational plans and ensure directives are followed by personnel on the ground or in strategic positions.
Similarly, when discussing cosmic scanning on a scale such as a galaxy, overlapping scans are necessary to ensure complete coverage, despite challenges like the immense distances signals must travel, which can cause delays and result in signals from now-extinct civilizations. This concept, however, is more theoretical and falls under the realm of astrophysics rather than immediate military strategic planning. Nevertheless, both scenarios highlight the importance of coordination for strategic superiority.