the route for naval mines, and it was soon brought out that not only did the U.S. not have any minesweepers in the Persian Gulf, it did not have any easily accessible minesweepers at all, so the escort operation was placed on hold until minesweepers would be available. The Pentagon deployed Helicopter Mine Countermeasures Squadron 14 (HM-14) with eight minesweeping Sea Stallion helicopters, five oceangoing minesweepers, and six small coastal minesweepers—dramatically increasing U.S. presence in the Persian Gulf, and increasing the probability of an Iran–U.S. confrontation. U.S. Secretary of Defense Caspar Weinberger indirectly provoked Iran to retaliate. Subsequent operations In the following 14 months, many U.S. warships took up escort duties. At one point, more than 30 warships were in the region to support the operation. Operation Prime Chance Earnest Will overlapped with Operation Prime Chance, a largely secret effort to stop Iranian forces from attacking Persian Gulf shipping. Despite the protection offered by U.S. Navy vessels, Iran used mines and small boats to harass the convoys steaming to and from Kuwait, at the time a principal ally of Iraq. In late July 1987, Rear Admiral Harold J. Bernsen, commander of the Middle East Force, requested Naval Special Warfare assets. Special Boat Teams deployed with six Mark III Patrol Boats and two Navy SEAL platoons in August. The Middle East Force decided to convert two oil service barges, Hercules and Wimbrown VII, into mobile sea bases. These were moored in the northern Persian Gulf, allowing special operations forces to thwart clandestine Iranian mining and small boat attacks. On 21 September, Night Stalkers flying MH-6 and AH-6 "Little Birds" took off from the frigates and USS Klakring to track an Iranian ship, . The Nightstalkers watched Iran Ajr turn off its lights and begin laying mines. After receiving permission to attack, the helicopters fired guns and rockets, stopping the ship. Iran Ajrs crew continued to push mines over the side, and the aircraft resumed firing until the crew abandoned ship. At first light, a SEAL team, assisted by Special Boat Teams, boarded the vessel and discovered nine mines on the vessel's deck, as well as a logbook revealing areas where previous mines had been laid. towed the mine layer (a converted tank landing craft) to the Iran-Iraq war zone. Explosive Ordnance Disposal (EOD) technicians from EOD Mobile Unit 5 scuttled the vessel the following day. The logbook implicated Iran in mining