
There’s no credible mainstream reporting that 2,000 US Marines arrived in the Middle East aboard the USS Tripoli specifically in relation to Iran, and Iran being “shocked” hasn’t been reported by reliable news outlets such as Reuters, AP, BBC, etc. Videos on YouTube or social media claiming this are not verified news and may be misleading or speculative.
What reliable sources do report
The U.S. military is increasing its naval and air presence in the Middle East amid rising tension with Iran, including additional warships and aircraft carriers moving toward the region. The USS Abraham Lincoln carrier was reported heading to the Middle East in recent weeks as part of this buildup.

USS Tripoli activity
The Tripoli is an America-class amphibious assault ship that normally carries Marines and aircraft such as F-35B and MV-22 Ospreys as part of a Marine Expeditionary Unit, but official information places it operating with the U.S. 7th Fleet in the Indo-Pacific (around Japan) as part of routine deployments — not in the Middle East.
How these naval deployments fit into the bigger picture
The U.S. has been moving more military assets (including carriers, destroyers, and aircraft) toward the Middle East because of ongoing tensions with Iran’s government, nuclear program negotiations, and recent strategic shifts in regional posture. Some news reports describe these as the largest U.S. naval buildup in the region in recent years, but they don’t mention Tripoli or exactly 2,000 Marines arriving.

In short
The specific claim about 2,000 Marines arriving aboard USS Tripoli and Iran being particularly “shocked” isn’t supported by reputable news sources. There is a broader confirmed buildup of U.S. military forces in the Middle East tied to regional tensions, but most reliable reporting points to other ships and ongoing strategic repositioning rather than a Tripoli marine landing.