The US Navy holds overwhelming technological superiority in the Persian Gulf, fielding modern destroyers such as the Frank E. Petersen and the Michael Murphy. These ships, over 155 meters long and costing more than $2 billion each, carry roughly 96 guided missiles for engaging air, surface and land targets. However, this powerful air and missile defense system is not invulnerable to all threats, which drives potential adversaries to seek asymmetric responses.
One such response from the Islamic Republic of Iran has been a tactic known as "swarms of mosquitoes." It involves the mass employment of fast attack craft that, like persistent insects, are intended to disorganize and exhaust the defenses of a larger adversary. These craft, including the Zolfikar, Seraj and Tufan models, are based at more than ten coastal bases, as well as in fortified caves and on strategic islands such as Farur in the Strait of Hormuz, enabling covert and sudden attacks.
Each boat is equipped with weapons designed for engagement at various ranges. Their arsenal includes heavy machine guns for close combat, multiple-rocket launch systems, anti-ship missiles with ranges up to 100 kilometers, and light torpedoes. In addition, Iranian forces actively employ strike drones with ranges up to 50 km, as well as capabilities for laying naval mines and using explosive-laden suicide boats.
The tactical aim of the "swarms of mosquitoes" is less about physically destroying costly American destroyers than about disrupting and wearing them down. Simultaneous attacks by many small, fast and diversely armed targets overload the defenses of large ships, which cannot physically cover all vessels in a narrow strait at once. This creates vulnerabilities that Iranian forces seek to exploit.
Operations take place within a so-called "danger zone" about six nautical miles wide, declared by the Islamic Revolutionary Guard Corps (IRGC). In the confined and busy waters of the Strait of Hormuz, even the threat of an attack on a single vessel or its damage can trigger widespread panic and seriously disrupt international shipping. The use of mines, drones and suicide boats makes any potential confrontation extremely difficult to counter and prolongs the economic consequences of any incident, putting pressure on global trade.
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What role does the Islamic Revolutionary Guard Corps play within Iran’s armed forces and why does it control key operations in the Strait of Hormuz? - The Islamic Revolutionary Guard Corps (IRGC) is Iran’s elite military force, established after the 1979 revolution and reporting directly to the Supreme Leader. Unlike the regular army (Artesh), the IRGC is responsible for protecting the Islamic system and has its own structure, including naval forces. The IRGC controls operations in the Strait of Hormuz because the strait is of critical strategic importance to Iran, and the IRGC possesses specialized units and tactics for asymmetric warfare in confined maritime spaces.
Why do Farur Island and other fortified bases in the strait hold such strategic importance for Iran’s “swarms of mosquitoes” doctrine? - Farur Island and similar bases serve as key footholds for implementing the “swarms of mosquitoes” doctrine — an asymmetric strategy based on using numerous small, fast and mobile units (such as fast attack craft and drones). These bases allow Iran to control choke points in the strait, rapidly deploy forces and pose a threat to larger ships of potential adversaries, leveraging surprise and local superiority.
What is the legal status and practical effect of the “danger zone” declared by the IRGC in the Strait of Hormuz under international maritime law? - Under international maritime law, in particular the United Nations Convention on the Law of the Sea (UNCLOS), the Strait of Hormuz is an international strait where the right of transit passage applies. Iran’s declaration of a “danger zone” has no legal recognition internationally and is regarded by many countries as a unilateral action. Practical consequences include increased risks to shipping, the potential for incidents, and a need for international vessels to consider Iranian warnings, although formally they are not obliged to comply with such unilateral restrictions in international waters.
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