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WASHINGTON —The United States launched airstrikes on Iraqi and Syrian targets linked to Iran's Revolutionary Guard and the militias Tehran backs, following an attack on one of the many sites across the Middle East where the U.S. has a military presence.
Here is what we know about the U.S. military presence in the Middle East:
Where are U.S. bases in the Middle East?
The U.S. has operated bases around the Middle East for decades. At its peak, there were more than 100,000 U.S. troops in Afghanistan in 2011 and over 160,000 personnel in Iraq in 2007.
While the number is far lower after withdrawal from Afghanistan in 2021, there are still about 30,000 U.S. troops scattered across the region. In addition, since the Israel-Hamas war began in October, the U.S. has temporarily sent thousands of additional troops to the region, including on warships.
The largest U.S. base in the Middle East is located in Qatar, known as Al Udeid Air Base and built in 1996. Other countries where the U.S. has a presence include Bahrain, Kuwait, Saudi Arabia and the United Arab Emirates.
The U.S. has roughly 900 troops in Syria, in small bases such as al Omar Oil field and al-Shaddadi, mostly in the northeast of the country. There is a small outpost near the county's border with Iraq and Jordan, known as the Al Tanf garrison.
There are 2,500 personnel in Iraq, spread around facilities such as Union III and Ain al-Asad air base, although talks are ongoing about the future of those troops.
Why are U.S. troops stationed in the region?
U.S. troops are stationed in the Middle East for different reasons and, with the exception of Syria, they are there with the permission of each country's government.
In some countries such as Iraq and Syria, U.S. troops are there to fight against Islamic State militants and are also helping advise local forces. But they have come under attack from Iran-backed forces over the past several years and have taken action against them.
Jordan, a key U.S. ally in the region, has hundreds of U.S. trainers, and they hold extensive exercises throughout the year.
In other cases, like in Qatar and the UAE, U.S. troops have a presence to reassure allies, carry out training and to be used as needed in operations in the region.
Are there foreign military bases in the U.S.?
While Washington's allies sometimes send their troops to train or work with U.S. troops, there are no foreign military bases inside the U.S.
What is Tower 22 in Jordan?
Tower 22, a base in Jordan at the most northeastern point where the country's borders meet Syria and Iraq, was hit in a drone attack on January 28 that killed three Army Reserve soldiers.
Washington blamed Iran-backed, Iraqi militia Kataib Hezbollah.
Specifically, Tower 22 is near Al Tanf garrison, which is located across the border in Syria and which houses a small number of U.S. troops. Tanf had been key in the fight against Islamic State and has assumed a role as part of a U.S. strategy to contain Iran's military build-up in eastern Syria.
Do U.S. bases in the region get attacked often?
U.S. bases are highly guarded facilities, including with air defense systems to protect against missiles or drones.
Facilities in countries such as Qatar, Bahrain, Saudi Arabia and Kuwait are not usually attacked.
But U.S. troops in Iraq and Syria have come under frequent attack in recent years. Since October 7, U.S. troops have been attacked more than 160 times by Iran-backed militia, injuring about 80 troops, even prior to Sunday's attack on Tower 22, which injured around 40 more.
A new wave of violence in the Middle East erupted after October 7 when Islamist Palestinian Hamas fighters burst into Israel and killed 1,200 Israelis and took some 240 hostage. In response, Israel unleashed a military campaign that has killed more than 27,000 people, according to Gaza health authorities, and caused a severe humanitarian crisis in the densely populated Gaza Strip.
Reuters is a news agency founded in 1851 and owned by the Thomson Reuters Corporation based in Toronto, Canada. One of the world's largest wire services, it provides financial news as well as international coverage in over 16 languages to more than 1000 newspapers and 750 broadcasters around the globe.