What can you tell me about the combat survival radio for downed pilots?

The Combat Survivor Evader Locator (CSEL) is the U.S. Department of Defense (DoD) Program of Record for Joint Search and Rescue. This fully qualified, next-generation survival radio system is comprised of over-the-horizon relays, ground, and user equipment segments for the joint services. Today, CSEL is providing global coverage for U.S. DoD forces world wide.