What was the commander's most valuable intillenge tools during the corean war?

During the Korean War, one of the commander's most valuable intelligence tools was aerial reconnaissance, particularly through the use of high-altitude reconnaissance aircraft like the U-2. Additionally, signals intelligence (SIGINT) played a crucial role in intercepting enemy communications, providing insights into troop movements and strategies. Human intelligence (HUMINT) from spies and defectors also contributed significantly to understanding North Korean plans and capabilities. Together, these tools enabled commanders to make informed strategic decisions throughout the conflict.