Which of the following codes is primarily concerned with Civil-military operations?

The code that is primarily concerned with Civil-military operations is S5. This designation typically aligns with planning and coordination for interactions between military and civilian entities. S5 encompasses the execution of operations that involve cooperation and support to civil authorities, particularly in situations where the military may assist in disaster response, humanitarian assistance, or maintaining peace and order.

In contrast, the other codes focus on different operational areas. For example, S4 often relates to logistics and supply chain management; S2 is concerned with intelligence operations; and S6 is typically involved with communications and information systems. Understanding the distinct roles of each code helps clarify why S5 is specifically suited for civil-military operations, emphasizing the importance of cooperation between military forces and civilian organizations in various scenarios.