The Multiyear Crunch: Rebuilding the U.S. Missile Arsenal After the Iran War
The 39-day bombing and air defense campaign against Iran—headlined by Operation Epic Fury—proved the overwhelming effectiveness of U.S. and allied forces. However, it came at a staggering cost to America’s industrial base. A recent, sobering analysis by Mark F. Cancian and Chris H. Park of the Center for Strategic and International Studies (CSIS) details a harsh reality: while the U.S. maintained enough munitions to handle Iran, the heavy expenditure has depleted critical stockpiles, creating a dangerous “window of vulnerability” for any potential conflict in the Western Pacific.
Defense Secretary Pete Hegseth summarized the dilemma cleanly, noting it will take “months and years . . . depending on the weapon system” to replenish inventories. The Trump administration’s massive $1.5 trillion FY 2027 defense budget heavily funds munitions procurement to correct this, but money can’t immediately buy back time.
Here is a breakdown of how long it will take the U.S. military to rebuild its missile depth, based on CSIS’s projections.
The Long Road Back: 3+ Years to Recover
The most heavily utilized systems during the conflict face the steepest climb back to prewar baseline levels.
- Tomahawk Land Attack Missiles (TLAM): Over 1,000 Tomahawks were expended. Despite a massive Navy request for 785 missiles in FY 2027, the current annual production rate is under 200 due to historically low ordering. With a 34-month production lead time, these new orders won’t even begin hitting inventories until March 2030, meaning a full recovery won’t happen until late 2030 or early 2031.
- Patriot Interceptors (PAC-3 MSE): Rebuilding Patriot stocks is a complex juggling act involving U.S. needs, ongoing aid to Ukraine, and demands from 17 allied nations. The Army requested a staggering 3,203 Patriots in FY 2027. However, with an administrative and production lead time totaling 31 months, these interceptors won’t start arriving until mid-2029, pushing estimated inventory recovery to mid-2029.
- THAAD: Highly utilized in Operations Epic Fury and Midnight Hammer, between 190 and 290 THAAD interceptors were fired. The Army has requested 857 interceptors in FY 2027. Deliveries are projected to start in mid-2029, with a projected recovery by late 2029.
The Moderate Gap: ~2 Years to Recover
Ship-launched interceptors saw less action because U.S. naval assets were positioned further out in the Arabian Sea and Eastern Mediterranean, away from short-range Iranian fire. No air-defense-capable warships entered the Persian Gulf prior to the ceasefire.
- SM-3 and SM-6: Despite lower usage (130–250 for SM-3; 190–370 for SM-6), these sophisticated naval missiles suffer from notoriously long production lead times. The FY 2027 budget requests massive buys (including 540 SM-6s), but due to a 36-to-39-month lag before deliveries begin, inventories won’t stabilize until late 2028 or early 2029.
Quick Turnarounds: Months to a Year
A couple of key systems are positioned to recover rapidly, either due to healthy pre-existing production lines or limited operational use.
- JASSM (Joint Air-to-Surface Standoff Missile): The U.S. went into the war with a robust stock of JASSMs, having averaged nearly 500 orders a year for a decade. Though 1,100+ were expended, the factory lines are already running at surge capacity. The inventory is expected to recover by mid-2027.
- PrSM (Precision Strike Missile): The Army’s new PrSM system only entered full production last July, meaning prewar inventory was low and usage was limited (40–70 missiles). Replacing these will take only a few months, with recovery expected by late 2026.
Munitions Recovery At a Glance
| Munition System | Estimated Use in Iran War | FY 2027 Request | Current Annual Capacity | Estimated Return to Prewar Levels |
| PrSM | 40–70 | 1,134 | 80 | Late 2026 |
| JASSM | 1,100+ | 821 | 860 | Mid-2027 |
| SM-6 | 190–370 | 540 | 239 | Late 2028–Early 2029 |
| SM-3 | 130–250 | 214 | 56 | Early 2029 |
| Patriot | 1,060–1,430 | 3,203 | 2,000 | Mid-2029 |
| THAAD | 190–290 | 857 | 96 | Mid to Late 2029 |
| Tomahawk | 1,000+ | 785 | 600 | Late 2030–Early 2031 |
The Geopolitical Friction
This backlog isn’t just an American defense problem; it’s an international diplomatic headache. The U.S. is obligated to fulfill major foreign military sales. For instance, Japan is waiting on 400 Tomahawks, while Saudi Arabia and the UAE—who depleted their own stocks defending against Iranian missiles—are waiting on hundreds of Patriot and THAAD interceptors.
To mitigate the near-term domestic shortfall, the Pentagon has quietly re-sequenced deliveries to prioritize U.S. stockpiles over foreign partners, a move that has already sparked bilateral friction.
The Bottom Line
The Trump administration has signed multiyear framework agreements with defense contractors to aggressively scale up maximum industrial output (e.g., trying to push THAAD capacity from 96 to 400 annually). But building complex, precision-guided machinery takes a fixed amount of administrative and industrial lead time.
Until these lines deliver, the Pentagon faces a tight rope walk. Military planners will have to lean on less-optimal munition substitutions, accept higher platform vulnerabilities, and rely on a psychological edge: China is acutely aware of the tactical mastery America just displayed in the Middle East, which may be the very thing that preserves deterrence in the Pacific while the U.S. rebuilds its magazines.
Defense Secretary Pete Hegseth summarized the dilemma cleanly, noting it will take “months and years . . . depending on the weapon system” to replenish inventories. The Trump administration’s massive $1.5 trillion FY 2027 defense budget heavily funds munitions procurement to correct this, but money can’t immediately buy back time.
Here is a breakdown of how long it will take the U.S. military to rebuild its missile depth, based on CSIS’s projections.
The Long Road Back: 3+ Years to Recover
The most heavily utilized systems during the conflict face the steepest climb back to prewar baseline levels.
- Tomahawk Land Attack Missiles (TLAM): Over 1,000 Tomahawks were expended. Despite a massive Navy request for 785 missiles in FY 2027, the current annual production rate is under 200 due to historically low ordering. With a 34-month production lead time, these new orders won’t even begin hitting inventories until March 2030, meaning a full recovery won’t happen until late 2030 or early 2031.
- Patriot Interceptors (PAC-3 MSE): Rebuilding Patriot stocks is a complex juggling act involving U.S. needs, ongoing aid to Ukraine, and demands from 17 allied nations. The Army requested a staggering 3,203 Patriots in FY 2027. However, with an administrative and production lead time totaling 31 months, these interceptors won’t start arriving until mid-2029, pushing estimated inventory recovery to mid-2029.
- THAAD: Highly utilized in Operations Epic Fury and Midnight Hammer, between 190 and 290 THAAD interceptors were fired. The Army has requested 857 interceptors in FY 2027. Deliveries are projected to start in mid-2029, with a projected recovery by late 2029.
The Moderate Gap: ~2 Years to Recover
Ship-launched interceptors saw less action because U.S. naval assets were positioned further out in the Arabian Sea and Eastern Mediterranean, away from short-range Iranian fire. No air-defense-capable warships entered the Persian Gulf prior to the ceasefire.
- SM-3 and SM-6: Despite lower usage (130–250 for SM-3; 190–370 for SM-6), these sophisticated naval missiles suffer from notoriously long production lead times. The FY 2027 budget requests massive buys (including 540 SM-6s), but due to a 36-to-39-month lag before deliveries begin, inventories won’t stabilize until late 2028 or early 2029.
Quick Turnarounds: Months to a Year
A couple of key systems are positioned to recover rapidly, either due to healthy pre-existing production lines or limited operational use.
- JASSM (Joint Air-to-Surface Standoff Missile): The U.S. went into the war with a robust stock of JASSMs, having averaged nearly 500 orders a year for a decade. Though 1,100+ were expended, the factory lines are already running at surge capacity. The inventory is expected to recover by mid-2027.
- PrSM (Precision Strike Missile): The Army’s new PrSM system only entered full production last July, meaning prewar inventory was low and usage was limited (40–70 missiles). Replacing these will take only a few months, with recovery expected by late 2026.
Munitions Recovery At a Glance
| Munition System | Estimated Use in Iran War | FY 2027 Request | Current Annual Capacity | Estimated Return to Prewar Levels |
| PrSM | 40–70 | 1,134 | 80 | Late 2026 |
| JASSM | 1,100+ | 821 | 860 | Mid-2027 |
| SM-6 | 190–370 | 540 | 239 | Late 2028–Early 2029 |
| SM-3 | 130–250 | 214 | 56 | Early 2029 |
| Patriot | 1,060–1,430 | 3,203 | 2,000 | Mid-2029 |
| THAAD | 190–290 | 857 | 96 | Mid to Late 2029 |
| Tomahawk | 1,000+ | 785 | 600 | Late 2030–Early 2031 |
The Geopolitical Friction
This backlog isn’t just an American defense problem; it’s an international diplomatic headache. The U.S. is obligated to fulfill major foreign military sales. For instance, Japan is waiting on 400 Tomahawks, while Saudi Arabia and the UAE—who depleted their own stocks defending against Iranian missiles—are waiting on hundreds of Patriot and THAAD interceptors.
To mitigate the near-term domestic shortfall, the Pentagon has quietly re-sequenced deliveries to prioritize U.S. stockpiles over foreign partners, a move that has already sparked bilateral friction.
The Bottom Line
The Trump administration has signed multiyear framework agreements with defense contractors to aggressively scale up maximum industrial output (e.g., trying to push THAAD capacity from 96 to 400 annually). But building complex, precision-guided machinery takes a fixed amount of administrative and industrial lead time.
Until these lines deliver, the Pentagon faces a tightrope walk. Military planners will have to lean on less-optimal munition substitutions, accept higher platform vulnerabilities, and rely on a psychological edge: China is acutely aware of the tactical mastery America just displayed in the Middle East, which may be the very thing that preserves deterrence in the Pacific while the U.S. rebuilds its magazines.