What are the three methods of communication used in defense operations?

The three methods of communication used in defense operations are wire, radio, and messenger. This combination covers a range of communication needs in various operational contexts.

Wire communication is traditional but reliable, often used for secure and stable connections in fixed locations. In contrast, radio communication offers the flexibility of wireless transmission over distances, facilitating real-time coordination and command across mobile units. Messenger communication, while seemingly outdated in the digital age, can be crucial in situations where electronic communications may be compromised or when rapid delivery of messages is required on the ground, particularly in dense urban environments or during tactical maneuvers.

The other choices do not accurately encompass the primary methods utilized in defense operations. For instance, while options may mention cable or satellite communications, the essence of defense communication often revolves around the most direct and immediate methods, such as those specified in the correct choice.