Brazil lives within a regional security context, a “securosphere” that is immensely hard to avoid. Strenuous disagreements among defense and security agencies over approaches to precise methods of identification, measurement, and reactions of living and emerging threats on this securosphere proved their shared ability to be mistaken. This article proposes a national security border system of systems with enough power of discrimination and capacity for integration to address danger or take advantage of changing circumstances across Brazil's borders, tied to appropriate outcomes of the security agents. I discriminate sensible topological differences to lay out interconnection patterns of the various elements defining three specific border environments, using them to plan a more successful action. I also discriminate between subtle similarities among practical operational concepts of the armed forces and the police forces to provide better-analyzed premises, using them to build wholeness of understanding. From a better understanding of the whole, we can infer system requirements for the parts, providing capacity to conduct a disciplined exercise of planning with politically and financially affordable costs.