The blockade of the strait requires constant co-ordination between dozens of dispersed commanders controlling different weapon systems and units.
Fast-attack boat squadrons must communicate with coastal missile batteries to avoid friendly fire.
Mine-laying operations must be co-ordinated with patrol schedules. Intelligence on approaching vessels must flow from reconnaissance units to strike commanders within minutes.
Tangsiri served as the co-ordinator who understood the entire picture and could issue orders.
The 63-year-old had commanded the Islamic Revolutionary Guard Corps (IRGC) navy since 2018, overseeing the force’s transformation from a coastal defence organisation into an asymmetric naval power capable of threatening the world’s most powerful navy.
He was, according to Israel Katz, the Israeli defence minister, “directly responsible for terrorist attacks and the blockade of the Strait of Hormuz”. And then he was “blown up” by Israel.
His replacement – probably a deputy who steps up in the immediate aftermath – inherits operational command without the established relationships, institutional knowledge or authority Tangsiri wielded through years of command.
The situation is similar, on a lower level, to the chaos that engulfed Iran’s political leadership following supreme leader Ali Khamenei’s assassination on February 28.
For days, the republic struggled to function as competing factions manoeuvred, unclear lines of authority paralysed decision-making, and mid-level officials hesitated to act without knowing who would ultimately hold power or when to go on “fire at will” mode.
Only when the Assembly of Experts selected Mojtaba Khamenei on March 8 did the paralysis begin to lift.
The IRGC navy now faces similar turmoil. Who actually commands? The most senior operational commander or someone from the IRGC central office?
Until succession is sorted, every order carries uncertainty about whether it will be countermanded by tomorrow’s actual commander.
Military effectiveness depends on more than organisational charts.
Successful commanders know their subordinates – their capabilities, limitations, personalities, and trustworthiness.
They have built relationships over years that enable them to read situations, judge reports and issue orders with confidence their intent will be understood and executed.
Tangsiri knew the mid-level and lower-level commanders controlling individual boat squadrons, missile batteries, coastal positions, which commanders could be trusted with independent action and which needed explicit direction.
That knowledge, accumulated through years of command and weeks of active combat operations, cannot be transferred to a successor through briefings.
The new commander, whoever emerges, faces a learning curve measured in weeks while managing the most consequential naval operation Iran has ever conducted.
The immediate response within the IRGC navy command structure is likely to combine panic at losing its leader with hesitation about taking initiative without clear authority.
Coordination between dispersed units may break down and response times to new threats will lengthen as reports move up unclear chains of command.
Subordinates may adopt overly conservative approaches to avoid taking blame for mistakes made without proper authority.
Yet despite Donald Trump’s claims of destroying Iran’s navy, the fundamental capability to close the Strait of Hormuz persists.
Trump said this week that Iran’s leaders were “begging” to reach a deal to end the war while claiming Tehran was not negotiating with the US.
In a post on Truth Social, the US President warned: “They had better get serious soon, before it is too late.”
He has backed up his bluster. The USS Tripoli will arrive by the weekend, with roughly 2200 marines on board, under the control of US Central Command, which is responsible for US forces in the Middle East.
It is expected to take a few more days for the ship to reach the strait.
The Pentagon has ordered a second marine unit, also composed of around 2500 troops, to depart from its base in California and head to the Middle East.
The 11th Marine Expeditionary Unit, which operates from the USS Boxer and its amphibious ready group, left California last week and could reach the theatre by mid-April.
Iran’s strategy never depended on sophisticated command and control. It relies on geography, persistence and tactical simplicity that subordinate commanders can execute without strong leadership.
The strait’s narrowest point spans just 21 miles. Iran does not need to sink every ship. It only needs to create sufficient risk that commercial shipping refuses to transit.
Strategically, Iran retains the capability to keep the strait closed. The mines remain, the missiles remain, the boats remain and the geography has not changed.
Tactically, however, Tangsiri’s death creates immediate vulnerabilities. Co-ordination will suffer, response times will slow and units may operate at cross purposes.
The days and weeks following a major leadership change are the moments of maximum confusion when co-ordinated operations become most difficult.
But killing Tangsiri does not solve the fundamental problem because Iran still controls the chokepoint through which a fifth of the world’s oil must flow.
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