Iran Retains 70% of Missile Stockpile, ISW Warns of Rebuilt War Capacity

Months of U.S. and Israeli strikes have not delivered the degradation of Iranian military power that the campaign was designed to achieve. That is the central finding of a new Institute for the Study of War assessment, published May 13, which concluded that Iran has restored operational access to 30 of its 33 missile sites along the Hormuz region and retains roughly 70 percent of its pre-war missile stockpile. The assessment lands at the precise moment the ceasefire has lost its diplomatic scaffolding — and as Tehran signals it is preparing, not winding down.

The ISW finding reframes the strategic situation in a way that complicates every option Washington is currently weighing. A negotiated settlement was already failing before this assessment appeared. Resumed strikes will now encounter a target set that has substantially reconstituted. And the clock is running: Iran is not waiting for the next American move.

What ISW Found

The institute’s analysts, drawing on satellite imagery, open-source signals intelligence, and regional reporting, assessed that Iran’s missile infrastructure along the Hormuz corridor has been rebuilt faster than U.S. planners anticipated. Of the 33 sites that U.S. and Israeli strikes targeted, 30 have been assessed as operationally accessible — meaning Iran retains the ability to conduct missile launches from those positions.

The 70 percent stockpile retention figure is the more consequential number. A campaign that leaves an adversary with the majority of its pre-war offensive capability intact has not achieved suppression — it has achieved temporary disruption. The distinction matters because a disrupted force regenerates; a suppressed force cannot. Iran appears to fall in the first category.

ISW also noted that Iran has repositioned some assets to third countries assessed as unlikely U.S. strike targets. The dispersion strategy reduces the concentration of assets that any single strike package could reach, distributing risk across a geography that U.S. planners would have to address country by country — each with its own diplomatic and legal complications.

The “Martyr Commander” Exercise

On the same day the ISW assessment circulated, the Islamic Revolutionary Guard Corps launched a five-day exercise dubbed “Martyr Commander” centered on Tehran, with simultaneous IRGC Navy drills at Mahshahr Port near Bubiyan Island. The timing and the name are not incidental.

ISW assessed the naval component of the exercise with particular attention. The drills may serve one of two purposes — or both simultaneously: preparing new Hormuz operations to reimpose or tighten the blockade, or dispersing IRGC Navy vessels ahead of resumed U.S. strikes to reduce their exposure at known moorings. The dual-use nature of vessel dispersal exercises is a standard military hedge; it preserves capability while reducing vulnerability, and it provides political cover by framing offensive preparations as defensive readiness.

The Mahshahr Port location is geographically significant. The port sits near the northern end of the Persian Gulf, close to the Kuwaiti archipelago where IRGC operatives were arrested attempting to infiltrate Bubiyan Island earlier this month. The convergence of naval exercises at that location with the earlier infiltration attempt is consistent with IRGC interest in the northern Gulf approaches — the same shipping corridor through which Kuwaiti and Iraqi crude transits to global markets.

Tehran’s Political Signal

Iran’s military posture is running in parallel with an explicit political signal. Parliament Speaker Mohammad Baqer Ghalibaf, one of the IRGC’s most senior political figures, declared that Washington must accept Tehran’s terms “or face failure,” and described the U.S. peace proposal as surrender. Iranian forces were placed at “highest readiness,” a designation that carries formal operational significance within IRGC command structure.

The framing matters. Ghalibaf is not a peripheral voice in the regime’s decision-making apparatus — he ran for president twice and has been positioned within the system as a hardliner with genuine institutional authority. His characterization of the American proposal as surrender is calibrated to an internal Iranian audience: it forecloses the political space for any Iranian negotiator to accept terms that fall short of the current maximum position.

This is not a negotiating posture. It is a closing of the negotiating posture. The regime has decided, at least publicly and for now, that the cost of accepting U.S. terms exceeds the cost of continued confrontation. Whether that calculus is correct depends on factors Tehran may be misreading — but the signal is unambiguous.

The Economic Pressure Track

The Trump administration moved to tighten its economic campaign even as the diplomatic track collapsed. Treasury’s “Economic Fury” sanctions round, announced May 12, designated 12 IRGC-linked oil entities including the IRGC’s Shahid Purja’fari Oil Headquarters — a node that sits at the center of the regime’s energy revenue network — along with front companies operating in Hong Kong and the UAE. The action froze nearly $500 million in crypto assets linked to the designated network.

The designation of the Shahid Purja’fari Oil Headquarters is analytically significant because it targets the revenue-generation side of the IRGC’s operational finance rather than its procurement networks. Previous rounds focused on the front companies that buy weapons components. This round aims at the cash flow that funds the entire structure. Whether that targeting logic translates into actual financial disruption depends on how successfully Iran has diversified its oil revenue routing — a question the ISW stockpile retention figures suggest it has had time and resources to address.

Brent crude closed at $106.01 on May 13 as markets continued pricing in sustained Hormuz disruption risk. The global inventory drain documented by the IEA has removed the buffer that historically absorbed short-term supply shocks; at current inventory levels, any resumed disruption to Hormuz traffic would hit an already-stressed market with limited cushion.

The Strategic Arithmetic

The ISW assessment, read alongside the “Martyr Commander” exercises and Ghalibaf’s public statements, produces a specific strategic picture: Iran has used the ceasefire period to reconstitute military capability, disperse assets, and harden its political position, while signaling readiness for renewed hostilities on terms more favorable to Tehran than those that existed when the ceasefire began.

That picture complicates the Trump administration’s combat resumption calculus in ways that were not fully visible two weeks ago. Renewed strikes would encounter a more resilient target set. The ISW finding that 30 of 33 missile sites have been restored suggests that a second strike campaign would need to be substantially larger than the first to achieve the same damage — and even then, Iran’s dispersal strategy means some fraction of the stockpile would survive in locations the U.S. cannot easily reach.

The Senate’s 50-49 war powers vote has not resolved the authorization question in a way that gives the administration political cover for a sustained campaign. The Trump-Xi summit in Beijing adds a further constraint: Chinese cooperation on Iranian sanctions enforcement is not guaranteed, and Beijing’s leverage over Tehran’s energy revenues is a variable the administration cannot control unilaterally.

The ceasefire, technically, remains in effect. But the conditions that made it viable — a belief on both sides that negotiations could produce an acceptable outcome — no longer appear to hold. Iran has used the pause to rearm. Washington is watching a target set regenerate. And the ISW assessment, framed as a warning, functions equally well as a military planning document: it tells both sides precisely how much capacity Iran has retained and where the reconstituted threat is concentrated.

The next escalation, if it comes, will not start from the same military balance as the last one.

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ISW assessment and Euronews reporting, CBS News live-update coverage of IRGC exercises and Iranian political statements, and U.S. State Department Economic Fury sanctions announcement cited above.