Initially, coalition leaders, including US President Obama, said their ground forces would not be used in the fight against ISIL either in Iraq or Syria unless they were local coalition forces. With the general withdrawal continuing, the
White House announced late on 21 February that 200 residual US troops would remain in Syria as a "peacekeeping force". The peacekeeping deployment would be indefinite. On 3 November 2019 US and coalition forces departed their strategic military base near the town of
Sarrin. US forces removed all their equipment and were seen leaving the base in a convoy of tens of trucks. The base was one of the largest US bases in Syria, a logistics hub that assisted in the anti-ISIL intervention. On 17 November, Russia's state-owned
Zvezda channel aired footage of armed Russian
sappers and Military Police seizing control of the Kobanî airbase days prior, with choppers landing on the US-made airstrip there and the Russian flag seen hoisted over the fortification, of which had been hastily stripped of essentials by coalition personnel, only leaving behind
toiletries, sleeping facilities, some
exercise equipment, and other small items. While Syrian government troops gradually re-established its presence in the region, Russia and Turkey continued to occupy and conduct patrols throughout north east Syria as well, in accordance with the
Sochi Agreement. By 4 December, the US had completed its military pullback from northeastern Syria and had consolidated its troop presence in the country to a "relatively static" 600 personnel, according to Mark Esper. The withdrawal from north Syria was partially carried out by the US Army
103rd Expeditionary Sustainment Command's Syria Logistics Cell (SLC), a key component of the Army's
1st Theater Sustainment Command, Special Operations Joint Task Force-Operation Inherent Resolve, and Combined Joint Task Force-Operation Inherent Resolve.
2019–20: Eastern Syria redeployment on 26 October 2019, amid the return of US forces to oil fields in northeast Syria By 20 October 2019, Bradley IFVs of the 4th Battalion, 118th Infantry Regiment accompany a patrol in eastern Syria, 13 November 2019 On 30 October, the 4th Battalion,
118th Infantry Regiment, a US
combined arms battalion equipped with
M2A2 Bradley IFVs deployed to the Deir ez-Zor region to help guard SDF-US controlled oil and gas fields. The battalion is part of the US
Army National Guard's
30th ABCT which had begun arriving in Kuwait the week prior to relieve the regular
Army 3rd Brigade Combat Team, 4th Infantry Division in support of
Operation Spartan Shield, the US's theater-level contingency force for the Middle East. On 3 November,
OIR officials confirmed that multiple artillery rounds landed about one kilometer from a road with a US convoy; OIR, without offering additional details, stated no personnel were injured and the patrol was not hit. The
Russian Defense Ministry were the first to report the incident, adding that the incident was near
Tell Tamer and that it was elements of
Turkish-backed rebels that fired the artillery. By mid-January 2020, tensions between Russian and US forces in northeast Syria had reportedly grown as US troops had increasingly begun blocking Russian convoys from accessing certain major roads between towns. Both Russia and the US operate military outposts throughout the region as a part of their respective missions. On 25 August, a Russian military vehicle rammed a US armored car near
al-Malikiyah, northeastern Syria, in which four US soldiers had suffered mild concussions. Russian defense minister
Sergey Shoygu said that "the US armed forces soldiers tried to block the Russian patrol"; meanwhile, a US defense official said that Russian forces went to a "security zone" that they should not enter. On 30 July 2020, the Autonomous Administration of North and East Syria signed an agreement with an American oil company, Delta Crescent Energy LLC, to develop
oil fields in the region. The Syrian authorities condemned the agreement, and mentioned that: "This agreement is null and void and has no legal basis." Seizing oil without local government permission would be a
war crime of
pillage. On 19 September, the US deployed additional troops, equipment and armored vehicles to north-eastern Syria after tensions with Russia escalated in the region. According to officials, the moves were meant "to help ensure the safety and security of coalition forces." US Central Command mentioned that the United States had deployed
Sentinel radars and Bradley vehicles to augment forces in the "Eastern Syria Security Area" (ESSA). The reinforcements were considered a response to a 26 August incident where a Russian armored vehicle collided with a coalition M-ATV, injuring four US soldiers. It was reported on 30 November 2020 that an airstrike near the
Iraq–Syria border killed an unidentified
Islamic Revolutionary Guard Corps commander and three other men traveling with him from Iraq and into Syria. The vehicle was struck after it entered Syrian territory. Iraqi security and local militia officials said the commander's vehicle had weapons in it and that pro-Iran paramilitary groups helped retrieve the bodies. Sources did not identify the commander nor elaborate on the exact time of the incident. It was not immediately known who conducted the strike, and
Reuters could not independently verify the reports.
2021–24: Continued Iranian—US proxy conflict troops conduct area
reconnaissance in Syria, 18 February 2021 On 10 February 2021, Pentagon Press Secretary
John Kirby told reporters that US troops were not committed to protecting Syrian oil fields except "for where appropriate under certain existing authorizations to protect civilians." He added that "DOD [Department of Defense] personnel or contractors are not authorized to provide assistance to any other private company, including its employees or agents, seeking to develop oil resources in northeastern Syria." On 28 June 2021,
President Biden directed airstrikes against Iran-backed militia groups close to the Syria-Iraq border.
F-15E and
F-16 aircraft were used to launch the attack in what the U.S. described as a retaliatory attack against U.S. facilities and personnel in Iraq by militia groups. Two operational and weapons storage facilities were targeted in Syria, the U.S. military revealed in a statement. Despite the U.S. not disclosing the information regarding the casualties in the attack, the
SOHR stated that at least nine Iran-backed Iraqi militia fighters died, leaving many others injured. Iraqi militia groups aligned with Iran in a statement named four members of the Kataib Sayyed al-Shuhada faction they said were killed in the attack on the Syria-Iraq border. Hours later, U.S. forces in Syria came under fire, following the U.S. strikes on the Syria-Iraqi border. Pro-Iranian militias fired rockets at the American base at
Al-Omar Oilfield in Syria in response to U.S. airstrikes. The U.S. coalition responded by firing heavy artillery on Iranian-backed Militias Positions around
Al-Mayadin. There were no injuries sustained during the attack, the spokesman for
Operation Inherent Resolve, Col. Wayne Marotto disclosed. On 10 July 2021, a mortar shell landed near MSS Conoco, with no injuries reported. It was reportedly the fourth attack on or near U.S. troops or diplomats within a week, reportedly including one in which two service members were injured. No group claimed responsibility, but U.S. forces suspected Iran-backed proxy militias of carrying out such attacks. On 20 October 2021, troops at the al-Tanf garrison were
attacked by bomb-laden drones in what Pentagon spokesman John Kirby called a "complex, coordinated and deliberate attack". U.S. officials reportedly blamed Iran and its proxy forces for the attack, but publicly declined to specify details of the attack and whether the U.S. was considering retaliation. There were no reports of deaths or injuries. Attacks by small drones carrying munitions have posed a consistent threat to U.S. forces in eastern Syria since at least March 2020, with U.S. forces suspecting ISIL or Iran-backed elements of conducting the attacks, as U.S.-Iranian tensions in the region have persisted. On 24 August 2022, Joe Biden ordered airstrikes on claimed
IRGC and
Russian-backed proxy groups in
Syria near
Deir ez-Zor. The airstrikes were in retaliation on an attack on the
Al-Tanf garrison. The airstrikes were also considered a massive setback in negotiations in order to revive the
JCPOA. Airstrikes were also reported on 25 August. Iran strongly condemned the strikes and denied any links with the targets. The
Syrian Observatory for Human Rights claimed that
Liwa Fatemiyoun and the
Syrian Army were targeted in the airstrikes. On 23 March 2023, at 1:38 p.m. local time (
UTC+03:00), a
kamikaze drone allegedly of Iranian origin struck a coalition base at
Abu Hajar Airport near
Rmelan,
al-Hasakah Governorate in northeastern Syria,
The New York Times reported, US officials said the main air defense system at the base was "not fully operational" at the time of Thursday's Drone Strike. In retaliation, U.S. President
Joe Biden authorized a response with an airstrike on
IRGC-linked targets, including a weapons warehouse in the Harabish neighborhood in
Deir ez-Zor, and military posts in the
al-Mayadin and
Abu Kamal countryside, killing 14 people including nine Syrians, according to
SOHR. On 24 March 2023, 10 rockets were launched at the Green Village near al-Omar oil field which injured another American serviceman. On 30 March, the
Pentagon revealed that twelve American were wounded in total with six U.S. troops in Syria suffering traumatic brain injuries due to the two attacks by Iran-backed militias. A little-known militant group known as Liwa Al-Ghaliboun (The Brigade of Those who Prevail) On 26 October,
United States DoD said it conducted airstrikes on two facilities in eastern Syria linked to IRGC-backed militias in retaliation for the attacks. Tensions escalated significantly on 28 January 2024 when a one-way
attack drone struck Tower 22, a small U.S. outpost in northeastern Jordan near the Syrian border, killing three U.S. soldiers and wounding dozens. The attack, attributed by U.S. officials to Iran-backed militias, marked the deadliest assault on American forces in the region in years. Following the incident, the United States launched large-scale
retaliatory airstrikes in early February 2024 against more than 80 targets across Iraq and Syria, including command-and-control facilities, weapons depots, and logistics hubs associated with the IRGC and allied militias.
2024–26: Post-Assad drawdown Commander, US Army Maj. Gen.
Kevin Leahy, and Lt. Col. Ross Daly, assigned to
10th Mountain, Task Force Armadillo, all speak together to both SFA and US Army officers in the Deconfliction Zone, Al-Tanf, February 2025 killing a
Hurras al-Din senior military leader, 23 February 2025 with U.S. president
Donald Trump and Crown Prince of Saudi Arabia
Mohammed bin Salman in
Riyadh, Saudi Arabia, 14 May 2025 A
series of nationwide offensives launched in late November 2024 by the
Syrian opposition, headed primarily by
Hayat Tahrir al-Sham (HTS), led to a swift collapse in the Syrian military's strength and control, and the
overthrow of Assad on 8 December 2024. American officials openly stated that there was no US involvement in the operations. The same day that opposition forces
entered Damascus, CENTCOM said that it had attacked over 75 targets associated with IS. With the primary conflict between the government and the opposition largely ceasing, the US began evaluating its future role in Syria. This was compounded with the re-election of Donald Trump as President, who was set to take office in January 2025 off a campaign focusing on
American disengagement from foreign conflicts. Biden administration officials maintained that the US would still focus on countering IS as its primary activity in Syria. The Department of Defense admitted later in December that the actual number of American soldiers in Syria was 2,000 and not 900 as previously reported. A slew of US airstrikes targeted leaders of
Hurras al-Din, al-Qaeda's official branch in Syria, after it had announced its dissolution on 28 January 2025. Between 30 January and 25 February 2025, CENTCOM forces conducted five airstrikes, four in Idlib and one in Aleppo, which altogether killed six or seven people whom the US claimed to be senior Hurras al-Din leaders. In May 2025, US President Donald Trump met with Syrian Interim President
Ahmed al-Sharaa and agreed to cooperate with the new Syrian government, beginning a shift in Washington's relations with Syria up to that point. Spokesperson
Sean Parnell announced on 17 April 2025 that the Department of Defense would facilitate the "consolidation of US forces in Syria... to select locations," and bring the total amount of US soldiers in the country to less that 1,000. As part of newly-appointed Special Envoy
Thomas Barrack's refreshed policy on Syria, around 500 soldiers were withdrawn from the country in May 2025, while the last US base in Deir ez-Zor was also left. Barrack said that the military intended to leave seven of their eight bases in the country. On 25 July 2025, US forces conducted a ground raid in Aleppo Governorate which killed senior IS leader Dhiya' Zawba Muslih al-Hardani, and his two sons, who were both adults and IS members. Three women and three children were at the site of the raid and remained unharmed, while US forces suffered no casualties. On 19 August, a month later, CENTCOM conducted a strike in
Atme, Syria, killing Abu Hafs al-Hashimi al-Qurashi, an Iraqi national who was a senior IS leader and key financier. On 7 October 2025, CENTCOM killed Muhammad Abd-al-Wahhab al-Ahmad on 2 October, who was an attack planner of
Ansar al-Islam, an Al-Qaeda affiliated group.
December 2025 Palmyra ambush and retaliation In mid December 2025, two US soldiers and one interpreter
were killed by a member of the al-Sharaa government's
internal security forces. The killer was killed by US military.
US President Trump blamed ISIS and said that the US would retaliate. During the night from 19 to 20 December, US military aircraft including
F-15s,
A-10s, and
Boeing AH-64 Apache helicopters;
M142 HIMARS systems; and Jordanian
F-16s
bombed 70 targets, aiming to kill ISIS fighters and destroy ISIS infrastructure. Over the following 10 days, coalition forces conducted 11 ground missions, which resulted in the deaths of several ISIS fighters and the capture of others. On 10 January 2026, U.S. and Jordanian forces launched a second wave of airstrikes on dozens of ISIS positions near Deir ez-Zor. CENTCOM said more than a dozen aircraft, including
F-15Es,
A-10s,
AC-130Js, MQ-9 drones, and Jordanian F-16s, fired over 90 munitions on those targets. On 16 January, U.S. forces carried out an airstrike in northwestern Syria that killed Bilal Hasan al-Jasim, a senior militant leader believed to be affiliated with an Al-Qaeda-linked group and connected to the Palmyra ambush. In January 2026, a
northeastern Syria offensive conducted by the
Syrian transitional government against the Kurdish-led SDF led to a significant security vacuum, resulting in the escape and mass transfer of thousands of ISIS detainees. Following the SDF's withdrawal from key facilities such as the
al-Hawl and
al-Shaddadi prisons, the U.S. military began relocating up to 9,000 detainees to Iraq to prevent a resurgence of ISIS, while Syrian government forces assumed control of several major detention centers, including al-Aqtan prison in Raqqa.
Withdrawal On 11 February 2026, the U.S. withdrew its troops from the strategic
al-Tanf military base in southeastern Syria, relocating forces and equipment into Jordan after years of operating there as part of the coalition against ISIS. Syrian government forces moved in quickly following the pullout and have taken control of the site near the borders with Jordan and Iraq, marking a significant shift in the American military presence in Syria. On 15 February, U.S. forces completed their withdrawal from
al-Shaddadi base in northeastern Syria, handing the facility over to Syrian government forces and relocating personnel and equipment to Iraq. Coalition forces were also reported to be evacuating the
Kharab al-Jir base near
Rmelan, dismantling or destroying parts of the facility and relocating equipment toward Iraq as part of the broader U.S. military drawdown in the country. On 18 February, U.S. President Donald Trump ordered the complete withdrawal of all remaining American troops from Syria within the next two months. Prior to the announcement of a full withdrawal, the remaining U.S. military presence in Syria had already been significantly reduced and was largely confined to three installations in Hasakah province, including oil fields near Rmelan, Himo near
Qamishli, and Qasrak overlooking the
M4 highway. In the following days, U.S. military truck convoys were reported entering northeastern Syria from Iraq via the
Al Waleed border crossing to assist in the evacuation of remaining bases, transporting equipment and logistical supplies as part of the broader American military drawdown from the country. On 14 March, the Syrian forces took control of the Rmelan base following the coalition withdrawal. On 16 April 2026,
U.S. military forces completed their withdrawal when American troops evacuated the Qasrak air base in
Hasakah province, ending the U.S. military intervention in Syria after troops first arrived in 2015 to fight against the
Islamic State (IS) militant group. After the evacuation of American troops from the Qasrak base,
Syrian military forces entered the base and took control of it. Syrian government issued a statement announcing that it took control of all military sites in Syria that were previously occupied by US troops. == Turkish involvement ==