PONY EXPRESS was the code name for a DoD program to collect information on Soviet missile tests. There were several components to the program. Two large tracking ships, USNS GENERAL H.H. ARNOLD (T-AGM-09) and USNS GENERAL HOYT S. VANDENBERG (T-AGM-10), used sophisticated telemetry antennas and radars to track the missiles and collect telemetry in the mid-course and reentry phases.