The incident underscores Diego Garcia’s growing strategic significance as tensions spread beyond the Gulf into the Indian Ocean. The reported launch came as Washington moved thousands of additional Marines and sailors to West Asia amid fears of a wider conflict.
BY PC Bureau
March 21, 2026: Iran launched two intermediate-range ballistic missiles toward Diego Garcia in the Indian Ocean, but neither struck the joint US-UK military base on the strategically located atoll, the Wall Street Journal reported on Friday, citing US officials.
According to the report, one missile broke apart mid-flight, while a US warship fired an SM-3 interceptor at the second. It remains unclear whether the interceptor destroyed the missile. The timing of the launch was not disclosed.
The White House, the British embassy in Washington, and the UK Ministry of Defence did not immediately respond to Reuters requests for comment.
Diego Garcia, part of the British Indian Ocean Territory, hosts a key US-UK military facility operated primarily by the United States. The base serves as a crucial hub for air and naval operations across a wide strategic arc stretching from Africa to the Middle East and Asia.
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It has played a major role in past US military campaigns, including in Iraq and Afghanistan, serving as a launch point for long-range bombers and supporting submarine deployments, surveillance missions, and other naval operations. Its remote location also makes it a secure site for stockpiling fuel, military equipment, and supplies, enabling rapid response during regional crises.
JUST IN— 🇺🇸🇮🇷 Iran launched 2 intermediate-range ballistic missiles toward Diego Garcia airbase, which hosts US B-2 Spirit bombers about 4000 km from Iran. pic.twitter.com/9blnMKSye2
— Strategic Affairs News (@PabanSingh82441) March 21, 2026
The atoll is central to Washington’s strategic posture in the Indian Ocean, allowing the US to monitor and counter regional threats, including from Iran and China. Its isolation and heavy fortification make it one of America’s most secure overseas military installations.
The reported missile launch comes as the United States moves to reinforce its military presence in West Asia. Three US officials said on Friday that thousands of additional Marines and sailors were being deployed to the region to strengthen operational capacity amid the escalating conflict.
One official said the USS Boxer, along with two other amphibious assault ships and around 2,500 Marines from the 11th Marine Expeditionary Unit, was heading to West Asia from San Diego. Two other officials confirmed the deployment, though they did not specify the ships’ destination. The same official said the troops were departing nearly three weeks ahead of schedule.
The latest reinforcement would add to the roughly 50,000 US troops already stationed in West Asia and could place two Marine Expeditionary Units in the region. Such units, typically made up of about 2,500 Marines each, are capable of carrying out airstrikes, amphibious assaults, and ground operations.
Separately, US forces are stepping up efforts to secure the Strait of Hormuz, a critical global shipping route. Officials said US warplanes and attack helicopters have intensified strikes against Iranian drones and naval vessels as part of a broader campaign to keep the waterway open.
Gen Dan Caine said on Thursday that low-flying A-10 Warthog aircraft were “hunting and killing” fast-attack boats operated by Iran’s Revolutionary Guard in contested waters. He added that some regional allies were also using Apache attack helicopters against one-way attack drones increasingly deployed by Iran in the Gulf.
Axios reported on Friday, citing four sources, that the US is also considering plans to occupy Kharg Island as part of efforts to pressure Tehran into reopening the Strait of Hormuz.
