What is a tactical communication system characterized by?

A tactical communication system is characterized by being self-contained within a command structure. This means it is designed to operate within the confines of a specific military or operational group, providing essential communications capabilities tailored to the needs of that command. Such systems are typically deployed in the field and provide secure and reliable communication that can be quickly set up and used in various environments, often during military operations. This self-contained nature allows troops to maintain effective communication even in austere conditions where other communication infrastructures may not be available.

The other options, while related to different types of communication systems, do not define the essence of a tactical communication system as accurately. Global reach and commercial use pertain more to civilian satellite communications and large-scale systems that serve broad audiences, rather than the focused and contained nature of tactical systems. High capacity and distance capability might suggest strengths of some communication systems, but they are not specific attributes of tactical systems, which prioritize agility and operability in limited scopes. Finally, reliance on commercial satellites points towards a dependence on external infrastructure, contrasting with the independent operations expected from tactical communications configured for military commands.