The objective of Operation Prime Chance was to protect the US oil tankers from the Iranian attack, during the Iran-Iraq war. This was a secret operation which involved the US to fly low altitude missions to and from the navy flight desks during the night. In the process, they became the first ever to use night vision goggles and forward looking infrared which helped them navigate in the night.
On 21st Sept., 1987 the SEALs spotted Iran Ajr, a ship that was laying mines. The SEALs attacked and seized the ship. During the raid 5 Iranians were killed and 26 were captured.