The Kheibar Shekan — Castle Breaker — is a medium-range ballistic missile with a 1,450km range and a 449-590kg warhead capacity. Its defining feature is solid-fuel propulsion: preloaded fuel means launch readiness in minutes, not the hours required by liquid-fuel predecessors. That single engineering choice changes the military math. Preemption becomes harder when there is no fuelling window to exploit, and detection becomes less likely when there is no fuel convoy to spot. Iran has deployed the missile against US military assets in Jordan, the UAE, Bahrain, Kuwait, and Iraq's Erbil since the conflict escalated from the February 28 US-Israeli strikes on Tehran. The IRGC released footage on July 20 showing Kheibar Shekan alongside Fateh-110, Zolfaghar, and Emad missiles targeting US positions. Four days earlier, the IRGC said it hit a US jet maintenance facility and a command-and-control centre in Jordan's Azraq with the same system. The missile sits within a layered Iranian arsenal spanning short-range systems (Fateh variants, Zolfaghar, Qiam-1, Shahab-1/2), medium-range platforms (Shahab-3, Emad, Ghadr-1, Khorramshahr, Sejjil, Haj Qassem), and cruise missiles (Soumar at 2,500km range, plus Ya-Ali, Quds variants, Hoveyzeh, Paveh, Ra'ad). Former Supreme Leader Khamenei's 2,200km range cap was lifted following Israel's 12-day war on Iran in June 2025. The arsenal is designed for saturation: short-range volleys compress warning time while medium-range systems hold Gulf-state bases and Israeli targets at risk. The latest escalation broke a month-long lull when US forces struck IRGC rocket launchers on Larak Island near the Strait of Hormuz and Bandar Abbas on Monday August 31. Iran responded with missiles and drones against US forces in Jordan. The US conducted further waves of strikes; Tehran reported civilian casualties including five killed and 68 injured at a wedding in Kuhestak. Both sides have declared they will respond to any further attacks, creating an open-ended escalation loop. The Strait of Hormuz is now back at the centre of the crisis. Twenty-five percent of the world's oil and petroleum products transit through the waterway in peacetime. Oil prices rose sharply this week as markets priced in the risk to energy shipments. Washington has simultaneously announced an economic pressure campaign targeting Iran's financial interests globally, layering economic warfare onto kinetic operations. The US comparison systems tell their own story. Lockheed Martin's Precision Strike Missiles reach 60-499km — tactically useful but not in the same range class. Tomahawk cruise missiles reach 2,500km but fly at low altitude and subsonic speed, making them a different threat category than a ballistic reentry vehicle. Iran's strategy is not to match US capability symmetrically but to make US regional basing expensive enough that the force-projection model itself comes under pressure. The structural dynamic is clear: the US maintains expensive, fixed forward bases within range of an adversary whose solid-fuel missiles are cheap, mobile, and rapidly deployable. Every exchange reinforces Iran's demonstration that its arsenal survived six months of US-Israeli strikes and remains operational. The cost asymmetry — mobile missile launchers versus billion-dollar airbases — is the core strategic fact the Castle Breaker is designed to advertise.
