How many interrogating aircraft can the Tactical Air Navigation AN/URN-20 set simultaneously provide individual distance measuring service for?

The Tactical Air Navigation AN/URN-20 system is designed to support a specific number of interrogating aircraft by providing individual distance measuring services. In this context, it can serve up to 100 aircraft at the same time. This capability allows for effective and accurate navigation and distance measurement for multiple aircraft, which is crucial for operations involving air traffic control and coordination.

The technology is built to ensure that even at this capacity, each aircraft receives precise and timely information necessary for safe navigation. This functionality emphasizes the system's efficiency and reliability in high-demand scenarios, making it an essential tool for tactical air navigation.

In contrast, other figures like 50, 75, or 125 do not align with the specifications of the AN/URN-20 system, indicating its operational limits and architecture are tailored for a maximum effective engagement with 100 simultaneous users.