The Islamic Revolutionary Guard Corps is still functioning as a military force, but it is now operating without centralized command authority following the systematic elimination of its top leadership. The IRGC’s so-called “mosaic defense” doctrine, adopted in 2008, deliberately distributed command authority across 31 provincial corps, each capable of independent military action. That design choice is now being tested under real combat conditions. After the killings of IRGC commander-in-chief Hossein Salami during the 12-day war with Israel in June 2025 and his successor Mohammad Pakpour during joint US-Israeli strikes on February 28, 2026, the organization is functioning on pre-delegated instructions with no single authority capable of standing it down.
Iranian Foreign Minister Abbas Araqchi acknowledged this reality on March 1, 2026, stating plainly: “Our military units are now independent and somehow isolated, and they are acting based on instructions — general instructions — given to them in advance.” Ahmad Vahidi was appointed as the IRGC’s new commander on March 6, 2026, described as the “fourth successor” amid ongoing conflict. But the question is not whether the IRGC has a named leader. The question is whether any leader can actually exercise meaningful command over a force that was specifically built to operate without one. This article examines how the IRGC’s decentralized structure works in practice, what the rapid loss of senior leadership means for the current conflict, and why the mosaic defense model creates risks that go well beyond Iran’s borders.
Table of Contents
- How Is the IRGC Still Functioning Without Central Command Authority?
- What Has the US-Israeli Military Campaign Actually Accomplished Against the IRGC?
- The International Response and IRGC Designations
- Mosaic Defense vs. Conventional Military Hierarchy — What Are the Tradeoffs?
- The Risk of Pre-Delegated Authority Without Oversight
- Lebanon’s Ban and the Unraveling of IRGC External Networks
- What Comes Next for the IRGC and the Region
- Conclusion
- Frequently Asked Questions
How Is the IRGC Still Functioning Without Central Command Authority?
The answer lies in a structural overhaul that happened nearly two decades before the current conflict. In September 2008, the IRGC reorganized itself into 31 provincial corps — one for each of Iran’s provinces — with each corps empowered to conduct military operations within its zone without requiring authorization from Tehran. Each provincial headquarters has its own command-and-control structure, its own chain of command, and commanders with the authority to make independent tactical and operational decisions. The system was designed specifically so that if senior leadership were killed and communications severed, local units would retain both authority and the capacity to act. this is not improvisation. It is doctrine.
The mosaic defense model integrates the IRGC, the Basij militia, regular Iranian army units, missile forces, naval assets, and local command structures into a distributed system. If one component is hit, others continue functioning. If a senior leader is killed, the chain of command does not collapse. Compare this to a traditional hierarchical military, where eliminating the commanding general can paralyze an entire corps. Under the mosaic model, the loss of Hossein Salami and then Mohammad Pakpour in rapid succession did not produce the kind of organizational paralysis that a conventional military would suffer. The system absorbed the blows and kept going. The practical effect, however, is something analysts describe as a force with “no one behind the wheel.” The IRGC was built so that central command is not required for continued operations, but this also means that no single authority can recall or restrain provincial units acting under pre-delegated orders. It is a military designed to survive decapitation, but the cost of that survivability is the loss of centralized control.
What Has the US-Israeli Military Campaign Actually Accomplished Against the IRGC?
The joint US-Israeli campaign against iran has been devastating by conventional measures. More than 1,000 people have been killed, Iranian cities have suffered significant damage, and over 1,000 IRGC personnel have been reported killed. The strikes have systematically targeted senior leadership, destroying the top of the command structure multiple times over. By any standard military assessment, these are serious losses. However, the critical limitation of this campaign is that it is running into the exact problem the mosaic doctrine was designed to create. The IRGC’s reported losses, while substantial, represent a fraction of the organization’s pre-war numbers. The IRGC is estimated to have had several hundred thousand personnel including Basij forces before the conflict began.
Killing 1,000 members and multiple commanders has not degraded the organization’s ability to function at the provincial level. If the strategic assumption behind the US-Israeli campaign was that killing enough senior leaders would cause the IRGC to collapse or capitulate, that assumption appears to have been wrong — not because the strikes failed to hit their targets, but because the target organization was specifically structured to absorb exactly this kind of attack. The appointment of Ahmad Vahidi as the new IRGC commander illustrates this dynamic. Vahidi is described as the “fourth successor,” taking command at a time when the IRGC has lost much of its senior military leadership. But his appointment may matter less than it would in a conventional military. The 31 provincial commanders are already operating under pre-delegated authority. Whether Vahidi can actually reassert centralized control — or whether anyone would want him to, given that decentralization is currently keeping the force alive — is an open question with serious implications.
The International Response and IRGC Designations
The diplomatic and legal walls closing in on the IRGC have tightened considerably in recent months. On January 29, 2026, the European Union designated the IRGC as a terrorist organization, a step EU member states had debated for years but had previously resisted. On March 5, 2026, Lebanon banned the IRGC from operating within its territory and stated that IRGC members would face deportation. The IRGC is now designated as a terrorist organization by Australia, Bahrain, Canada, Ecuador, the EU, Israel, Paraguay, Saudi Arabia, Sweden, Ukraine, and the United States. These designations matter because they restrict the IRGC’s ability to move money, personnel, and materiel through international channels.
The EU designation is particularly significant because it had been a holdout — European governments had previously argued that keeping channels open to Iran required distinguishing between the IRGC and the Iranian state. That distinction has now been formally abandoned by Brussels. But terrorist designations have a practical limit. They are effective tools for squeezing financing and restricting international movement, but they do not degrade the IRGC’s ability to operate within Iran’s own borders. The 31 provincial corps do not need international banking access or freedom of movement through European airports to continue conducting military operations inside Iran. The designations hurt the IRGC’s external networks — its proxies, its arms supply chains, its intelligence operations abroad — but they do not reach the decentralized military structure that is currently keeping the organization functional under sustained US-Israeli bombardment.
Mosaic Defense vs. Conventional Military Hierarchy — What Are the Tradeoffs?
A conventional hierarchical military has clear advantages: unified strategic direction, the ability to coordinate complex multi-front operations, and a single authority that can order a ceasefire or negotiate a surrender. The tradeoff is vulnerability. Kill the commanding general, destroy the communications infrastructure, and the whole system can seize up. The US military’s own “shock and awe” doctrine in Iraq in 2003 was designed to exploit exactly this weakness in Saddam Hussein’s conventional force structure. The mosaic defense model sacrifices those advantages for survivability. The IRGC’s 31 provincial corps can absorb leadership losses, continue operating under severed communications, and sustain resistance indefinitely without orders from Tehran. The tradeoff is that this structure is inherently harder to control, harder to coordinate, and — critically — harder to stand down.
In a decapitation scenario, what remains is a military operating under pre-delegated authority with no one capable of recalling it. Analysts describe this as a theocratic state operating without its theological anchor. This creates a genuine strategic problem for all parties. For the US and Israel, it means that even total success in eliminating IRGC leadership may not produce the desired result of ending Iranian military resistance. For Iran, it means that the decision to decentralize command authority may have created a force that no future Iranian government can easily bring to heel, even if that government wanted to negotiate an end to hostilities. The mosaic doctrine was designed for organizational survival. It was not designed for the aftermath.
The Risk of Pre-Delegated Authority Without Oversight
The most dangerous aspect of the IRGC’s current operational posture is what happens when pre-delegated authority operates without any oversight or updated guidance. Provincial commanders are acting on general instructions given in advance. Those instructions were presumably drafted with certain assumptions about the conflict — assumptions that may no longer hold as conditions on the ground change rapidly. Pre-delegated authority works well when the situation unfolds roughly as anticipated. It becomes dangerous when circumstances diverge from the plan. A provincial commander operating under standing orders to resist may continue fighting even when the strategic situation has changed in ways that make continued resistance counterproductive or catastrophic.
There is no mechanism for a ceasefire to reach units that are operating in communications isolation. There is no way to update rules of engagement for commanders who are acting on instructions written weeks or months earlier. This is not a hypothetical concern. The US experience with nuclear command authority during the Cold War involved extensive study of exactly this problem — how to maintain deterrence through pre-delegated launch authority while preventing unauthorized or outdated orders from being executed. The IRGC’s situation is analogous but less controlled. There is no equivalent of the permissive action link or the two-person rule. Provincial commanders have both the authority and the capability to act, and the chain that could restrain them has been severed.
Lebanon’s Ban and the Unraveling of IRGC External Networks
Lebanon’s decision on March 5, 2026, to ban the IRGC from operating within its territory marks a significant shift in the regional dynamics that sustained Iranian proxy networks for decades. Lebanon was the home base for Hezbollah, the IRGC’s most capable external proxy, and Lebanese territory served as a critical node in the IRGC’s logistical and command networks stretching from Tehran to the Mediterranean.
The formal ban and threat of deportation signal that even states that were once hospitable to IRGC operations are now distancing themselves under the pressure of combined military action and international designations. This is a loss the mosaic defense doctrine cannot compensate for — decentralized provincial commands inside Iran cannot replace external networks built over 40 years.
What Comes Next for the IRGC and the Region
The appointment of Ahmad Vahidi as the IRGC’s new commander may represent an attempt to reassert some degree of centralized authority, but the conditions under which he is taking command make that extremely difficult. He inherits an organization that has been functioning without centralized command for weeks, whose provincial commanders have grown accustomed to autonomous operations, and whose senior leadership ranks have been decimated by sustained strikes. Whether Vahidi can actually consolidate control — or whether the mosaic structure has now taken on a life of its own — will be one of the defining questions of this conflict’s next phase.
The broader concern for policymakers and analysts is what a post-conflict IRGC looks like. A decentralized military force that has been operating under pre-delegated authority during wartime does not easily snap back to centralized peacetime control. The same structure that makes the IRGC survivable in combat makes it resistant to being stood down. Any future diplomatic resolution will have to contend not just with the Iranian government but with 31 semi-autonomous military commands that may or may not accept orders from whatever political authority emerges on the other side of this conflict.
Conclusion
The IRGC’s mosaic defense doctrine is performing as designed. The organization has absorbed the loss of multiple commanders-in-chief, sustained over 1,000 personnel killed, and continued functioning through a joint US-Israeli military campaign that has devastated Iranian cities. The 31 provincial corps are operating under pre-delegated authority, maintaining military capability without centralized command. International designations from the EU, Lebanon’s ban, and the expanding list of countries classifying the IRGC as a terrorist organization are degrading the group’s external networks, but they are not reaching the internal military structure that keeps it operational. The strategic problem this creates is significant and unresolved.
The IRGC was built to survive exactly the kind of decapitation campaign being waged against it. That same design means there is no easy way to end its operations through military force alone. The system was constructed so that no single leader’s death would stop it, but the consequence is that no single leader’s order can stop it either. Policymakers, military planners, and the public should understand that the IRGC situation is not a simple matter of eliminating leadership until the organization collapses. The mosaic doctrine was specifically engineered to prevent that outcome, and so far, it is working.
Frequently Asked Questions
What is the IRGC’s mosaic defense doctrine?
The mosaic defense doctrine is a military restructuring adopted by the IRGC in September 2008 that divided the force into 31 provincial corps, each capable of independent operations without authorization from central command. The system was designed to ensure operational continuity even if senior leadership is eliminated and communications are severed.
Who is currently commanding the IRGC?
As of March 6, 2026, Ahmad Vahidi was appointed as the IRGC’s new commander. He is described as the “fourth successor” after multiple commanders were killed during the ongoing conflict. He takes command at a time when the IRGC has lost much of its senior military leadership.
Which countries have designated the IRGC as a terrorist organization?
As of early March 2026, the IRGC is designated as a terrorist organization by Australia, Bahrain, Canada, Ecuador, the European Union, Israel, Paraguay, Saudi Arabia, Sweden, Ukraine, and the United States. The EU’s designation came on January 29, 2026, and Lebanon banned the IRGC from its territory on March 5, 2026.
Can the IRGC’s provincial commanders be ordered to stand down?
This is one of the central concerns analysts have raised. The mosaic defense doctrine was designed so that provincial commanders retain authority and capacity to act even when communications with central command are severed. While a new central commander like Ahmad Vahidi could theoretically issue stand-down orders, the system was built to function without such orders, and there is no clear mechanism to ensure compliance from units operating in communications isolation.
How many IRGC personnel have been killed in the current conflict?
Over 1,000 IRGC personnel have been reported killed, though these losses represent a fraction of the organization’s pre-war numbers. The broader US-Israeli campaign has killed more than 1,000 people total and caused significant destruction in Iranian cities.