For six weeks, American and Israeli airstrikes have reshaped Iran's military posture in the Persian Gulf — yet the force that matters most remains largely intact. The Islamic Revolutionary Guard Corps' fast-attack fleet, a doctrine born from the lessons of a 1980s defeat, has outlasted the conventional navy it was designed to complement, keeping the Strait of Hormuz — the narrow passage through which a fifth of the world's oil flows — effectively closed. History has a way of rewarding those who learn from their losses, and Iran, it appears, learned well.
Iran's Fast-Attack Navy Largely Survives US-Israeli Strikes in Strait of Hormuz
Their asymmetrical strategy is working
Mark
So the conventional navy is gone, but the IRGC's fast boats are still mostly there. Why didn't the same strikes that worked on one work on the other?
Mimi
The IRGC learned from history. After the Tanker War in the 1980s, when the US destroyed Iran's fleet in a single day, they completely changed their approach. Instead of building a big, visible navy, they built small, fast boats that hide in underground pens along the coast. Satellites can't easily find them, and they're spread out instead of concentrated in a few ports.
Luke
But we should be careful here—the 60 percent figure comes from a single report. We don't know who conducted that assessment or what their methodology was. And "operational" doesn't necessarily mean combat-ready. How many of those boats are actually crewed and fueled and ready to move right now?
Mark
Fair point. But the attacks on shipping are real, right? Fifty attacks since the war started?
Mimi
Yes, that's documented by the conflict tracker. Mines, drones, the whole range. And it's working—2,000 ships stuck in the Gulf. That's not a guess.
Luke
True. But we should note that "attacks" can mean different things. Some might be actual strikes; others might be warnings or near-misses. The data tracker counts events, not necessarily successful hits.
Mark
So the real question is: can the US actually clear the strait, or is this going to be a long slog?
Mimi
That's what Trump's announcement suggests—they're moving from trying to destroy the boats to trying to actively manage the waterway. That's a different kind of operation entirely.
Luke
And we don't know yet if minesweeping and destroyer patrols will actually work against an enemy that can lay new mines faster than we can clear them. This could be a very long commitment.
The Pulse
- Over 155 Iranian conventional naval vessels have been sunk, yet more than 60% of the IRGC's fast-attack fleet remains operational and on patrol.
- The Strait of Hormuz is effectively closed — mined, drone-struck, and contested — leaving more than 2,000 ships trapped in the Gulf with nowhere to go.
- The IRGC has launched at least 50 attacks on shipping since the conflict began, proving that small, hidden, fast-moving boats can hold the world's oil supply hostage.
- Underground coastal pens, high-speed evasion, and dispersed operations make the IRGC fleet nearly impossible to neutralize through airstrikes alone.
- The Trump administration is now pivoting to minesweeping ships and destroyers — an acknowledgment that clearing the strait will require sustained naval engagement, not just air power.
For six weeks, American and Israeli airstrikes have reshaped Iran's military posture in the Persian Gulf — yet the force that matters most remains largely intact. The Islamic Revolutionary Guard Corps' fast-attack fleet, a doctrine born from the lessons of a 1980s defeat, has outlasted the conventional navy it was designed to complement, keeping the Strait of Hormuz — the narrow passage through which a fifth of the world's oil flows — effectively closed. History has a way of rewarding those who learn from their losses, and Iran, it appears, learned well.
Six weeks of US-Israeli airstrikes have effectively erased Iran's conventional navy — more than 155 vessels sunk, most of them in the opening weeks of the campaign. But the force that was always meant to matter most in this conflict, the Islamic Revolutionary Guard Corps' fast-attack fleet, has proven a different kind of adversary entirely. More than 60 percent of those smaller, faster vessels remain operational.
The durability of the IRGC's fleet is no accident. It is the product of a strategic reckoning that followed the Tanker War of the 1980s, when a single American strike devastated Iran's active navy. Rather than rebuild a conventional force susceptible to the same concentrated blow, Iran split its maritime responsibilities: the regular navy for broader Gulf operations, the IRGC for the Strait of Hormuz — a 20-mile chokepoint through which roughly one-fifth of the world's daily oil supply passes. The IRGC's vessels are small, fast, and launched from underground pens carved into the coastline, making them difficult to locate by satellite and harder still to destroy from the air.
The strategy has delivered real consequences. Since the conflict began, the IRGC has conducted at least 50 attacks on shipping in the Gulf and the strait. A combination of mines and drone strikes has effectively closed the waterway, leaving more than 2,000 vessels trapped. As one former Pentagon official put it plainly: 'Their asymmetrical strategy is working.'
President Trump announced Sunday that the United States would deploy minesweeping ships and destroyers to reopen the strait — a meaningful shift in approach, from destroying Iran's naval capacity to actively contesting and clearing the waterway. The move signals a recognition that airstrikes alone cannot resolve what the IRGC has built over decades, and that the coming phase of this conflict will be measured not in sorties, but in the slow, grinding work of reclaiming one of the world's most consequential passages.
Six weeks into the campaign of US-Israeli airstrikes against Iran's military infrastructure, the conventional navy has been largely erased from the map. More than 155 vessels have been sunk. By the accounts of American officials, the destruction was comprehensive and swift—the bulk of it accomplished in the opening three weeks of the conflict. But the Islamic Revolutionary Guard Corps' fast-attack fleet, the force tasked with controlling the Strait of Hormuz, has proven far more durable. According to recent analysis, more than 60 percent of these smaller, nimbler vessels remain operational and ready for patrol.
The resilience of the IRGC's navy reflects a strategic choice made decades ago, born from hard experience. During the Tanker War of the 1980s, the United States conducted a single devastating strike that destroyed much of Iran's active fleet. That lesson reshaped Iranian naval doctrine. Rather than rebuild a conventional force vulnerable to the same kind of concentrated assault, Iran divided its maritime responsibilities. The conventional navy would handle broader Gulf operations. The IRGC would specialize in the Strait of Hormuz—a 20-mile-wide chokepoint through which roughly one-fifth of the world's oil supply passes each day.
The IRGC's vessels are built for this specific mission: small, fast, and designed to operate from a network of underground pens carved into the rocky coastline. These characteristics make them difficult to locate via satellite and harder still to destroy in concentrated strikes. Chris Long, a former British naval officer who served in the Persian Gulf, explained the tactical advantage to the Wall Street Journal: "It will be a long time before the US can take all those out." The boats themselves are equipped with rocket launchers and the capability to lay mines across the waterway. In February, before the conflict began, Iran conducted live-fire drills showcasing these vessels moving at high speed in and out of their hidden berths—a deliberate demonstration of force timed to coincide with the American military buildup in the region.
The asymmetrical strategy has delivered tangible results. Since the war began, the IRGC has launched at least 50 attacks against shipping vessels transiting the Gulf and the Strait of Hormuz, according to the Armed Conflict Location and Event Data conflict tracker. The waterway has been effectively closed through a combination of underwater mines and drone strikes. More than 2,000 ships now sit trapped in the Gulf, unable to proceed. David Des Roches, who previously directed Persian Gulf policy at the Department of Defense, assessed the situation plainly: "Their asymmetrical strategy is working."
The contrast between the fate of Iran's two naval forces is stark and instructive. The conventional navy, built along traditional lines and concentrated in known ports, was vulnerable to the kind of sustained air campaign the US and Israel mounted. The IRGC's distributed, mobile, small-vessel approach has proven far more resilient. This disparity suggests that the conflict in the Strait of Hormuz will not be resolved quickly or through the methods that proved effective against Iran's conventional forces.
President Trump announced on Sunday that the United States and its allies would deploy minesweeping ships and destroyers to reopen the strait and allow trapped vessels to transit. The operation signals a shift in approach—from destroying Iran's naval capacity to actively clearing and securing the waterway. It also suggests a recognition that the IRGC's fleet cannot be eliminated through airstrikes alone, and that the coming phase of the conflict will require sustained naval operations to contest control of one of the world's most critical shipping lanes.
Notable Quotes
It will be a long time before the US can take all those out— Chris Long, former British naval officer in the Persian Gulf
Their asymmetrical strategy is working— David Des Roches, former director of Persian Gulf policy at the Department of Defense
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