During which conflict did radio become widespread for strategic and tactical communications?

The widespread use of radio for both strategic and tactical communications is most accurately associated with World War II. During this conflict, advancements in radio technology allowed military forces to communicate effectively across vast distances, enhancing coordination and operational efficiency. This period saw the implementation of various types of radio communication, including portable units that were crucial on the battlefield, allowing for real-time information sharing and command-and-control operations.

While radio technology did exist and was employed during World War I, its usage was not nearly as widespread or advanced compared to the developments that occurred by World War II. The lessons learned in the earlier conflict paved the way for more sophisticated communication methods that were fully realized and extensively utilized in World War II, making it a key factor in military success during that time.