The term "linkage" in the context of tactical communications specifically refers to the establishment of connections between communication nodes. This is essential for ensuring that various units can effectively communicate with one another, share crucial information, and maintain situational awareness during operations. Proper linkage allows for a coherent network where data can flow seamlessly, facilitating coordination and response among different teams and platforms.
While sharing data between units, using multiple encryption methods, and switching frequencies are all important aspects of tactical communications, they are not the core definition of "linkage." Instead, these concepts are more related to operational capabilities that can be supported through effective linkage between communication nodes. The integrity of the communications network relies on these connections to ensure reliable and timely exchanges of information, which is critical in a tactical environment.