IRGC Explained: Structure, Power and Role in the 2026 Iran War

The Islamic Revolutionary Guard Corps (IRGC) is Iran’s most powerful armed organization, a parallel military that answers to the Supreme Leader rather than to the elected president. This guide explains why it was created, how it is organized, how it projects power abroad, how it shapes Iran’s politics and economy, and what it has done in the 2026 war. Each section links to the Peter’s World reports behind it. For the live story, see our Iran, IRGC and Strait of Hormuz news hub.

Why the IRGC was created

According to the Council on Foreign Relations (CFR), Iran’s clerical leaders founded the IRGC after the 1979 revolution outside, and as a counterweight to, the traditional armed forces, which they distrusted. The model was a “people’s army” meant to protect the new state from a coup like the 1953 one that removed Prime Minister Mohammed Mossadeq. The Iran–Iraq War (1980–88) turned it into a more conventional fighting force. Its command structure bypasses the president and runs to the Supreme Leader.

How the IRGC is organized

The table summarizes the branches using figures that CFR attributes to the International Institute for Strategic Studies (IISS). These are estimates, and the Basij figure is the organization’s own claim.

BranchReported sizeRole
Ground forcesMore than 150,000Based across Iran’s 31 provinces and Tehran
Basij paramilitaryClaims it can mobilize about 600,000 volunteersInternal security and mobilization; under direct IRGC command since 2007
Naval forcesAbout 20,000 sailorsPatrol Iran’s waters, including the Strait of Hormuz; separate from the regular navy
Aerospace forceAbout 15,000 personnelRuns the ballistic missile program; separate from the regular air force
Cyber commandNot statedEspionage and propaganda, with an unclear link to state-affiliated hackers
Quds ForceNot statedExpeditionary arm that works with partner groups abroad

In total, CFR cites IISS as putting the Corps at upward of 190,000 troops, around half of them conscripts.

The IRGC abroad: the Quds Force and partner groups

The Quds Force became the IRGC’s external affairs branch, supplying training, weapons, money and advice to armed groups in Iraq, Lebanon, the Palestinian territories, Syria and Yemen, according to CFR. Tehran treats them as part of an anti-Western “axis of resistance,” although some operate independently. Hezbollah in Lebanon and the Houthis in Yemen are the two that matter most for the current war. Our coverage follows both: see the Gaza, Israel and Lebanon news hub for Hezbollah.

On Yemen, the Associated Press reported on Sept 23 that IRGC advisers helped Houthi forces seize Yemen’s Red Sea coast in an advance of roughly 115 kilometers, including the port of Mocha, according to officials and soldiers it interviewed. Iran has not accepted that account. The Wall Street Journal, as summarized in our report on Houthi arms supplies, added that Iranian-designed missiles, drones and mines, plus Chinese dual-use electronic components, sustain the group’s inventory. Analysts quoted there stress that this points to a commercial parts problem and is not evidence of direct Chinese weapons transfers. Read the detailed reporting in AP: IRGC Advisers Helped Houthis Seize Yemen’s Red Sea Coast.

Politics and money at home

CFR describes the IRGC as central to Iran’s domestic politics: former commanders hold senior posts in the cabinet, parliament and the provinces, and the Corps has built an economic empire in banking, shipping, manufacturing and imports, partly through no-bid state contracts. A 2020 Center for Strategic and International Studies report, quoted by CFR, called it the most powerful controller of important economic sectors in Iran. CFR also reports that the Corps was blamed for the severe suppression of mass protests in January 2026, a role that led the European Union to list it as a terrorist organization. Our Iran Executions Tracker and Memorial documents executions that monitors link to protest, political and espionage cases, including IRGC roles as reported.

The IRGC in the 2026 war

Several strands of our reporting show the Corps acting at sea, in sanctions policy and in diplomacy.

  • At sea. On Oct 7, Mohammadreza Naqdi, an adviser to the IRGC commander, told Fars news agency the Strait of Hormuz was closed and under full Iranian control. CENTCOM called that false. Details are in Iran, Oman Agree Hormuz Safe Routes as CENTCOM Rejects Closure Claim. In September, CENTCOM said it destroyed IRGC-linked tankers after missiles targeted a U.S. warship; Iranian outlets described the strikes as aggression against civilian energy traffic.
  • In sanctions. On Sep 30, the State Department offered rewards of up to $15 million for information on the finances of the IRGC Aerospace Force, alongside Treasury designations of 10 people and companies accused of procuring weapons for Iran’s armed forces. See US Sanctions 10 Iran Arms Buyers and Russia’s Yakovlev Bureau.
  • In diplomacy. Statements by IRGC-linked officials set conditions that run alongside the talks that the foreign ministry conducts through mediators, so the Corps shapes what negotiators can offer. That is our reading of the sequence, not an official statement.

Analysis: why the IRGC is hard to bargain with

This section is Peter’s World analysis based on the sources cited on this page. Forecasts are judgments, not facts.

Three features of the Corps complicate any settlement. First, it answers to the Supreme Leader, so a deal signed by the president or foreign minister does not automatically bind its commanders. Second, it holds both the tools of pressure and the incentives to use them: its navy patrols the strait, its aerospace force runs the missiles, and its Quds Force manages partners such as the Houthis. Third, it profits from sanctions, because its networks are best placed to move goods when legal trade is cut off, an effect CFR describes.

In our judgment, this explains why public statements from IRGC advisers and the foreign ministry can sound contradictory without being a mistake: they speak to different audiences and can both reflect leadership policy. It also suggests that sanctions aimed at the Corps’s finances and procurement, such as the September designations, target its capacity more than its intent. Whether the Corps would accept a reopening of the strait that it does not control remains an open question, and the clearest test would be how it responds to the Iran–Oman route agreement.

Frequently asked questions

Is the IRGC part of Iran’s regular army? No. It is a separate force with its own ground, naval and aerospace branches, parallel to the regular military.

What is the Quds Force? The IRGC’s expeditionary arm, which works with partner groups outside Iran.

Why does the IRGC matter for oil? Its naval forces patrol the strait through which about a quarter of seaborne oil passes. See Strait of Hormuz Explained.

All Peter’s World coverage

Every indexed report we have published on this topic, grouped by subtopic and listed newest first.

Sanctions, Congress and war powers

Houthis, Red Sea and Saudi Arabia

Diplomacy, nuclear file and the UN

Strait of Hormuz and shipping

Military operations and weapons

Other Iran coverage

Sources

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