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Iran's Islamic Revolutionary Guard Corps says it threatened to open fire on U.S. Marine Corps and Navy helicopters covering a group of American warships as they passed through the volatile Strait of Hormuz recently, prompting them to land. The U.S. Navy told The War Zone that no U.S. helicopters headed back to their ships while supporting the transit for any other reason than to refuel.

Pictures and video footage Iran released via the semi-official Tasnim News Agency yesterday show one of the country's new sea base-esque vessels, the Shahid Mahdavi, and other vessels, supported by drones flying above, very closely shadowing the U.S. naval contingent as it passed into the Persian Gulf last week. The actual transit occurred on August 17.

Only the U.S. Navy's Wasp class amphibious assault ship USS Bataan and Arleigh Burkeclass destroyer USSThomas Hudnerare visible in the Iranian pictures and videos. However, USNI News reported last week that the Harpers Ferry class amphibious warship USS Carter Hall had also sailed through the Strait of Hormuz on or about August 17.

At one point in the Iranian video clips of the transit, seen below, a member of the IRGC-N can be heard hailing the U.S. Navy vessels in English.

"This is coalition warship. I am engaged in transit passage in accordance with international law. Over," an apparent U.S. Navy sailor is then heard saying in response.

"Your helicopters is in vicinity [sic] of my vessel and also sometimes going into [over] Iranian territorial waters," the IRGC-N member is heard later in the video saying, again in English. "Advise you to take them on your boat and do not enter in Iranian territorial waters. If you do not obey my orders, we will open fire on your helicopters. Over."

It is worth noting that the Strait of Hormuz is so narrow that much of it is territorial waters belonging to either Iran or Oman. During routine transits into the Persian Gulf, U.S. naval vessels use the same shipping lane as commercial vessels, which passes through Iranian waters. They do so under the international rules ofinnocent passage, which allow warships from one country to sail through the maritime territory of another with certain restrictions.

The Iranian imagery shows at least one AH-1Z, UH-1Y, and MH-60 were airborne for a time during the transit. This is typical of U.S. force protection measures for ships moving through the Strait of Hormuz, which also includes personnel up on the decks making use of various weapon systems, including Stinger shoulder-fired surface-to-air missiles, also known as man-portable air defense systems (MANPADS).

From the grainy footage Iran has released, it's hard to tell how any of the U.S. helicopters may have been armed during the transit. The Navy did release pictures of the Bataan and Carter Hall operating in the Gulf of Oman prior to their transit into the Persian Gulf showing aircraft with live ordinance. This included AV-8Bs armed with AIM-9M Sidewinder and AIM-120 Advanced Medium Range Air-to-Air Missiles (AMRAAM) and AH-1Zs carrying AIM-9Ms, as well as AGM-179A Joint Air-to-Ground Missiles (JAGM) and AIM-114P Hellfire air-to-surface missiles. The AIM-114P and AGM-179A can be employed against various maritime threats, like small boats, as well as different types of targets on land.

Tasnim's report claimed that during the IRGC-N "forced it [the U.S. contingent] to heed Irans orders" and that "choppers flew off the US helicopter carrier's [USS Bataan's] flight deck, but were forced to land shortly afterwards."

There is nothing in the Iranian video clips to corroborate the assertion that the U.S. helicopters landed back on the Bataan in direct response to Iranian instructions.

"The story is untrue. No helo returned early to deck during the transit, other than to refuel," U.S. Navy Cdr. Rick Chernitzer, a spokesperson for U.S. Fifth Fleet, headquartered in Bahrain, told The War Zone in a statement. "The US Navy will continue to fly and sail where internationallaw allows."

"We interact with Iran at sea every day," Chernitzer added. "The overwhelmingmajority of interactions are safe and professional. This was the case last week."

At a press gaggle earlier today, Deputy Pentagon Press Secretary Sabrina Singh also pushed back against Iran's claims.

"That is not true... We've seen In this from them [the Iranians] before, pushing out, I don't know if it's propaganda, but I would say untrue statements, and that just is not accurate," she said. "have not seen the video... but I can just tell you that the reports that there was some type of intercept of a U.S. helicopter is just not true."

Is unclear whether or not these statements about Iran's claims being untrue extend to the explicit threat contained in the video released through Tasnim, and The War Zone has reached back out to U.S. Fifth Fleet for clarification.

When it comes to the actual capabilities of the Iranian force shadowing the U.S. warships on August 17, the largest ship in the contingent by far was the roughly 787-feet (240-meter) long Shahid Mahdavi, which the IRGC-N only took delivery of in March. The ship was converted from an Iranian state-owned and operated container ship known as the Sarvin, which had been previously sanctioned by the United States. It reportedly has a top speed of 18 knots and can sail up to 18,000 nautical miles without needing to refuel.

Imagery of the Shahid Mahdavi that the Iranians released at the time of delivery showedtwo Russian-made Mi-8/Mi-17 Hip-type helicopters and various uncrewed aerial vehicles on a new flight deck of sorts installed forward of the main superstructure. Two small boats and what appeared to be launchers for four anti-ship missiles were also seen on the aft deck behind the superstructure. The ship was also armed with four twin 23mm automatic cannons and various mounted heavy machine guns.

The IRGC-N's Commander, Rear Admiral Alireza Tangsiri, has previously claimed that the Shahid Mahdavi has a phased array radar, but there is no actual evidence of this.

In addition to the Shahid Mahdavi, the Iranian imagery from last week shows one of the IRGC-N's curious catamaran naval vessels, likely the lightly-armed Shahid Nazeri based on its largely open rear end and centrally located helipad, along with multiple small boats, also being used to monitor American vessels.

In addition, some of the Iranian video clips look to have been captured by drones orbiting above the Strait, something that Iran does regularly during U.S. Navy transits of the Strait of Hormuz. Whether U.S. forces used LMADISs or any other electronic warfare systems to try to prevent those drones from recording what was happening or otherwise hamper their activities is unknown.

The Iranians have previously shown a willingness to engage American drones in the region, mostly pointedly with the shootdown of a U.S. Navy RQ-4ABroad Area Maritime Surveillance-Demonstrator (BAMS-D) uncrewed aircraft in 2019. The risks associated with destroying uncrewed aircraft are, of course, very different from engaging crewed aircraft, including helicopters, since the former do not carry any personnel who could be killed or injured as a result.

The reason Bataan, Carter Hall, Thomas Hudner, and the 26th MEU are even in the region at the moment is to respond to an uptick in Iranian aggression that includes the seizure or attempted seizure of multiple commercial ships in recent months. There were reports earlier this month that the U.S. government was considering making Marines contingents available to embark on commercial ships to help protect them from Iran's forces.

U.S. Air Force F-35A Joint Strike Fighters and F-16 Vipers have also been deployed to the region for the same reason and have been helping to patrol areas around the Strait of Hormuz. Pictures the Navy previously released show a pair of F-35As flying over the Bataan and the Thomas Hudner in the Gulf of Oman on August 17, 2023. However, it is unclear where those jets were during the actual transit through the Strait of Hormuz that day and whether any other aircraft were scrambled in response to the appearance of IRGC forces.

As already noted, Iranian maritime forces very closely shadowing U.S. naval vessels in the Strait of Hormuz is routine. In one particularly notable example, in 2019, satellite imagery showed as many as 18 small Iranian boats alongside the Nimitzclass aircraft carrier USSAbraham Lincolnand other ships from its strike group as it headed toward the Gulf of Oman. At the time, U.S. Navy officials said this reflected "normal behavior patterns" for Iran.

For the moment, however, it seems more likely that we will see more of the Shahid Mahdavi, as well as Iran's other sea base-like ships, supporting more typical Iranian maritime activities in the Strait of Hormuz including the confrontational operations that often dominate them.

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Navy Shoots Down Iran's Claims It Forced U.S. Helicopters To Land - The War Zone