Command and control (C2)
Command and control is the exercise of authority over forces and the systems and processes that carry decisions, orders and information between commanders and units.
Command and control, usually written C2, covers how a military organisation makes decisions and turns them into coordinated action. Command is the authority vested in an individual to direct, coordinate and control military forces. Control is the means by which that authority is exercised and checked: gathering information, issuing orders, tracking execution and adjusting plans. In practice the term spans doctrine, people, processes and the technical systems that support them.
How it works
C2 is often described as a cycle. Information about the situation is collected and shared, a commander and staff assess it and decide, orders are passed to subordinate units, and results are fed back so that the next decision is informed. The technology layer consists of communication and information systems: networks, applications for planning and situational awareness, messaging, and the data standards that let different systems exchange information. The Allied joint doctrine publication on communication and information systems, AJP-6, lists command and control among the topics it covers in this field, alongside system structure, roles and security.
Structures differ by nation and alliance. Command relationships, such as which headquarters directs which forces, are set by doctrine and agreements. The systems must follow those relationships, but can also reshape them, for example by letting a decision be taken at a different level because the information is available there.
Interoperability and coalitions
Most operations involve more than one nation, so C2 depends on the ability of national systems to connect. NATO’s Digital Backbone illustrates the issue: the Alliance describes it as the technical means to ensure connectivity and data transport across all domains of operations, linking the edge to decision-makers and effectors and supporting political consultation and multi-domain operations.
Where the technology is going
Current programmes emphasise sharing data across services and domains rather than within a single platform or branch. This involves common data models, cloud and edge computing, and links between sensors and decision-makers, including tactical data links at the tactical level. Software increasingly defines C2 capability, which ties it to the themes in software-defined defence. Suppliers range from large integrators with long-established systems to software firms that offer planning and data-fusion products.
Why it matters
C2 determines how well the other elements of a force work together. A modern sensor or platform delivers limited value if its information cannot reach those who need it, or if orders cannot reach units in time. For governments, C2 is also a question of sovereignty and dependency: the software and data that carry decisions are strategic assets, and choices about suppliers and standards can bind a force for decades. C2 networks are a target for cyber and electromagnetic attack, so resilience and the ability to operate in degraded conditions are central design requirements.
What to watch
Points of interest include how closely national C2 systems align with allied standards, whether data-sharing across classification boundaries improves, how authorisation and security approval keep pace with software updates, and how far automation and decision-support tools are allowed to shape the decision cycle. Human accountability for decisions remains a fixed principle in most doctrines, and the debate is about how decision-support tools are governed rather than whether commanders remain responsible.
Sources
Related: Combat cloud · Multi-domain operations · Software-defined defence · Tactical data links (Link 16 and its relatives)