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Iran Conflict 2026
12JUN

F/A-18 disables tankers via smokestack on 8 May

4 min read
09:18UTC

A US Navy F/A-18 from USS George H.W. Bush put 500-pound laser-guided warheads down the chimneys of M/T Sea Star III and M/T Sevda on 8 May. CENTCOM's blockade redirection count climbed to 57.

ConflictDeveloping
Key takeaway

An aerial doctrine that disables tankers without sinking them, the same weekend Trump called it 'a love tap'.

An F/A-18 Super Hornet launched from the USS George H.W. Bush (CVN 77) disabled two Iranian-flagged tankers, M/T Sea Star III and M/T Sevda, on 8 May by firing precision munitions through their smokestacks 1. US Central Command (CENTCOM), the Pentagon command responsible for the Strait of Hormuz blockade, confirmed both vessels were attempting to reach Iranian ports in violation of standing redirection orders. The ordnance, likely 500-pound laser-guided warheads, was dropped down the chimney rather than into hull or magazine, disabling the propulsion and electrics without rupturing the cargo or killing the crew.

This was the third blockade enforcement action in a fortnight and the first to use aerial precision-disabling rather than naval gun fire. CENTCOM's commercial-vessel redirection count has now climbed from 48 on 3 May to 52 on 7 May to 57 on 8 May, five fresh redirections in two days. Four Iranian-flagged vessels have been physically disabled across the campaign so far 2. The technique maps onto a long-standing US Navy preference for proportional kinetic response: the 1988 Praying Mantis engagements aimed to neutralise Iranian platforms without sinking civilian shipping in the same waters. The 2026 variant uses laser-guided ordnance for what 1988 did with five-inch gun fire.

The Khatam al-Anbiya Central Headquarters, the IRGC overarching joint operational command, claimed "significant damage" to US destroyers from the 7-8 May missile, drone and small-boat salvos near Bandar Abbas . CENTCOM confirmed zero hull damage and zero US casualties 3. Tasnim, the IRGC-linked agency, cited an unnamed senior source claiming three US destroyers fled to the Gulf of Oman. Both accounts cannot be true; both are real official statements in an information war running behind the kinetic one.

Donald Trump described the same exchange to ABC News as "just a love tap" on the same weekend his pilots were dropping laser-guided ordnance down two tanker chimneys. The verbal de-escalation track and the kinetic enforcement track are no longer running on the same calendar. The new precision-disabling doctrine creates an evidentiary record (vessel still afloat, intact cargo, surviving crew) that enables prosecution under the Hormuz blockade legal architecture, where sinking would have foreclosed it. CENTCOM has not yet published the rules of engagement under which an aircraft may put precision munitions into a non-combatant tanker.

Deep Analysis

In plain English

A US Navy jet from the aircraft carrier USS George H.W. Bush flew over two Iranian oil tankers on 8 May and dropped precision bombs through their smokestacks, the metal exhaust chimneys on top of the ships. This disabled both ships' engines and electricity without blowing holes in the hull or igniting the cargo. This was not a random attack. The US has been enforcing a naval blockade, turning back ships trying to deliver oil to Iran. These two tankers were attempting to bypass the blockade to reach Iranian ports. The method of disabling through the smokestack, rather than firing at the hull, was chosen specifically to incapacitate the vessel without sinking it or killing the crew, so the ships can be towed away and the action defended as proportionate under international law. Despite this, President Trump described the same strikes to ABC News as 'just a love tap', while the actual bombs used weighed 500 pounds. The gap between his public description and what his military actually did illustrates how differently the verbal and military tracks of this war are being run.

Deep Analysis
Root Causes

The US Navy's preference for disabling rather than sinking reflects a structural constraint specific to the Strait of Hormuz geography.

The strait is 33 km wide at its narrowest navigable point; a sunk VLCC (Very Large Crude Carrier) at the choke would produce a navigational obstruction with a draught exceeding 20 metres, potentially closing the channel entirely for weeks. **CENTCOM** planners are operating with an implicit constraint that the blockade must remain selectively permeable: enough enforcement to coerce, not enough structural damage to make the strait itself unnavigable. Disabling-not-sinking preserves the option space.

The F/A-18 strike on M/T Sea Star III and M/T Sevda on 8 May is the third enforcement action and the first aerial one, driven by the absence of a surface-boarding alternative that could safely approach vessels in an active IRGC-fire environment. The switch to aerial precision was not a doctrinal preference but a tactical necessity produced by the IRGC's small-boat swarm tactics near Bandar Abbas.

What could happen next?
  • Precedent

    The smokestack precision-disabling technique, applied without published RoE, sets a doctrinal precedent other naval powers may cite to justify similar disabling strikes on third-party shipping in contested chokepoints.

    Medium term · 0.8
  • Risk

    Without published RoE, an aircraft crew error or escalation in a future engagement has no established legal boundary; the first fatality on a disabled tanker would collapse the proportionality defence CENTCOM is currently relying on.

    Short term · 0.82
  • Consequence

    The 57-vessel CENTCOM redirection count creates an evidentiary record that will be presented to the International Tribunal for the Law of the Sea once Iran or a flag state files; each disabled vessel is a discrete legal case.

    Long term · 0.7
First Reported In

Update #92 · An MOU asking Iran to surrender what nobody can count

Arms Control Association· 9 May 2026
Read original
Different Perspectives
Oil markets and Lloyd's of London
Oil markets and Lloyd's of London
Brent fell to $89.25 on ceasefire probability, not new barrels, with traders voting for Trump's deed over Tehran's denial. Lloyd's has not repriced Hormuz war-risk cover because its trigger requires a UN Security Council resolution or government certification, so tanker insurance costs remain elevated regardless of the spot move.
Pakistan and Qatar mediators
Pakistan and Qatar mediators
Pakistan's Mohsin Naqvi was in Tehran for his second visit in under a week, using the Pakistan-Qatar channel that delivered April's ceasefire after an identical public-denial cycle. The channel carries both civilian and military buy-in from Islamabad, the only configuration Iran's split command cannot dismiss as a partial signal.
India
India
India summoned the US Deputy Chief of Mission after three Indian sailors were killed aboard MT Settebello, the first formal grievance from a major non-belligerent directed at US enforcement. Indian seafarers supply roughly 12 per cent of the global maritime workforce; their presence on third-flag Gulf tankers is structurally inevitable regardless of bilateral diplomacy.
Islamic Revolutionary Guard Corps (IRGC)
Islamic Revolutionary Guard Corps (IRGC)
The IRGC declared Hormuz closed on 11 June while civilian negotiators were on the same mediation channel, then issued no public comment on the MoU framework. Its silence on the framework, rather than any foreign ministry statement, is the operative approval signal; the corps' unilateral Hormuz closure shows it did not treat the diplomatic track as binding on its operations.
Iran foreign ministry (Baghaei)
Iran foreign ministry (Baghaei)
Esmail Baghaei told IRNA that reports of a finalised deal were 'merely speculation' and that Iran had 'not yet made a final decision'. The denial is structurally identical to Iranian foreign ministry statements during the April ceasefire talks, which produced a binding text within 48 hours of the same language.
Trump administration / CENTCOM
Trump administration / CENTCOM
Trump cancelled the third strike day and called the MoU 'very strong' and almost ready to sign, while CENTCOM kept tanker enforcement running in the same 24-hour window. The administration is simultaneously withdrawing the military pressure it claims drove the deal and sustaining the enforcement campaign it is trying to trade away.