Iran Targets U.S.-U.K. Base on Diego Garcia with Missiles
Iran launched missiles at Diego Garcia, a strategically important joint U.S.-U.K. Military base in the Indian Ocean, on March 20, 2026, according to U.S., U.K., and Israeli officials . One missile failed mid-flight, and the other was reportedly shot down by U.S. Missile defenses . Iran has denied responsibility for the launches .
Strategic Importance of Diego Garcia
The U.S. Has described the Diego Garcia base as “an all but indispensable platform” for security operations in the Middle East, South Asia, and East Africa . Home to approximately 2,500 personnel, primarily American, the base has supported U.S. Military operations spanning from Vietnam to Iraq and Afghanistan . In 2008, the U.S. Acknowledged the base’s use in clandestine rendition flights of terror suspects .
Ballistic Missiles and Range
Diego Garcia is roughly 2,500 miles (4,000 kilometers) from Iran , a distance approximately twice as far as Iran’s previously declared maximum range for its ballistic missiles. Ballistic missiles follow an arc determined by gravity after initial rocket propulsion. Their range depends on the size of the rocket used for launch.
- Short-Range: 300-600 miles (500-1,000 km) – used for targeting defensive infrastructure.
- Medium-Range: 600-1,800 miles (1,000-3,000 km) – used for strategic targets like command centers.
- Intermediate-Range: 1,800-3,400 miles (3,000-5,500 km) – capable of reaching larger geographical areas.
- Intercontinental (ICBMs): 3,100-6,200 miles (5,000-10,000 km) – capable of striking targets globally.
Iran’s Missile Capabilities
Iran possesses an extensive ballistic missile program, including the Fateh, Shahab-2, and Zolfaghar systems . While some of these have ranges insufficient to directly reach Israel, they have been deployed by Iranian-backed militias in neighboring countries like Lebanon and Syria . Iran has also developed intermediate-range missiles like the Shahab-3, Sejjil, and Khorramshahr, capable of reaching Israel directly.
Extending Missile Range: Challenges and Modifications
Increasing a missile’s range presents significant technical challenges, including managing vibrations and maintaining payload capacity. Larger rockets require more advanced manufacturing and testing. Reducing the payload is one method Iran has reportedly used to extend the range of missiles like the Khorramshahr . Some reports suggest the missiles fired at Diego Garcia were modified Khorramshahrs .
Implications of the Attack
The attack on Diego Garcia, while unsuccessful in causing damage, may have been intended to demonstrate Iran’s capabilities and exert psychological and political pressure. The U.S. Demonstrated its ability to intercept one of the missiles, suggesting that Iran’s intermediate-range ballistic missiles do not currently pose a significant military threat. This conclusion aligns with the largely successful interception of hundreds of Iranian missiles and drones during an earlier attack on Israel in December 2025.