High Quality Content by WIKIPEDIA articles! Operation Credible Sport was a joint project of the U.S. military in the second half of 1980 to prepare for a second rescue attempt of the hostages held in Iran using a Lockheed C-130 Hercules airlifter modified with the addition of rocket engines. Credible Sport was terminated when on November 2, the Iranian parliament accepted an Algerian plan for release of the hostages, followed two days later by Ronald Reagan`s election as the U.S. President.