Operation Prime Chance was a United States Special Operations Command operation intended to protect U.S.-flagged oil tankers from Iranian attack during the Iran–Iraq War. The operation took place roughly at the same time as Operation Earnest Will, the largely naval effort to escort the tankers through the Persian Gulf. The operation was begun after the mining of the U.S.-flagged Kuwaiti oil tanker Bridgeton.
A U.S. Navy crewman stands atop the cabin of a PB Mark III patrol boat tied up to the oil rig service barge Wimbrown VII in the northern Persian Gulf. From lower to upper right, the barge is armed with a .50-caliber M2 machine gun, an 81 mm Mark 2 mortar, and a 40 mm Mk 19 grenade launcher.