What is the purpose of "River City"?

The purpose of "River City" is to restrict communication during critical operations, primarily to protect sensitive information and prevent potential adversaries from gaining insight into military movements and plans. By establishing River City, military leaders can impose a controlled communication environment, ensuring that only essential communications occur. This strategic measure helps safeguard operational security, especially during missions where the element of surprise is paramount or where the risk of exposure to hostile forces is high.

This practice is particularly important during transitions, deployments, or while conducting sensitive operations, where the risk of third-party interception or unauthorized disclosures could jeopardize mission success or endanger personnel. The other options, while related to operations in various ways, do not encapsulate the specific strategic intent behind implementing River City.