This is a US Navy news clip referencing a book titled "No Higher Honor". Operation Praying Mantis was the response to the near-sinking of the USS Samuel B. Roberts by an iranian sea mine. Iran was laying mines in international waters and damaging civilian shipping. So the US Navy escorted the civilian ships and caught the Iran Ajr in the midst of laying mines, it was captured and sunk. The mines in the minefield that damaged the Roberts matched the series of serial numbers from the Iran Ajr. So the US Navy demolished the iranian navy.