From November 2015 to 2019, the United States and allies carried out a large series of both airstrikes and drone strikes to intervene in Libya during the country's ongoing civil war that erupted following the 2011 overthrow of Muammar Gaddafi. The intervention was conducted in support of the Tripoli-based Government of National Accord and primarily targeted the ISIL presence in the region, which had exploited Libya's political fragmentation and security vacuum to establish a significant foothold in the country. By 2019, the ISIL branch had been largely driven from holding Libyan territory, and US strikes ceased.
Background
Military action against ISIL On 13 November 2015, the United States launched an airstrike in Derna, Libya. Two U.S. F-15E fighter jets targeted senior ISIL leader Abu Nabil al-Anbari in the airstrike, who was the top ISIL commander in Libya. In January 2016, ISIL's Libyan faction confirmed Abu Nabil's death in a eulogy to him.
Obama Administration officials were weighing a new campaign plan for Libya that would deepen the United States' military and diplomatic involvement, on yet another front against ISIL. The United States and its allies are increasing reconnaissance flights and intelligence collecting there—and even preparing for possible airstrikes and raids, according to senior American officials. Special Operations forces met with various Libyan groups near the end of 2016 to vet them for possible action against ISIL.
On 19 February 2016, US warplanes carried out an airstrike on multiple ISIL targets in Libya, hitting an ISIL training camp and a senior extremist leader, the training camp was near Sabratha, Libya, 60 people were present at the camp at the time of the strike, more than 40 people were killed with more wounded, some critically, On 14 February 2016, a U.N.-designated council presented a new 18-member Libyan cabinet in the Moroccan city of Skhirat, weeks after an earlier lineup was rejected. The internationally recognized parliament has to endorse the new unity cabinet. If approved, the new unity government could eventually seek international military intervention against ISIL extremists who have taken advantage of the country's political vacuum since 2014.
On 1 August 2016, U.S. crewed and uncrewed aircraft carried out airstrikes on ISIL targets in Libya, responding to the U.N.-backed government's request to help push the militants from their former stronghold of Sirte (where several hundred ISIL fighters remained), in what U.S. officials described as the start of a sustained campaign against the extremist group in the city. President Barack Obama authorized the airstrikes after a recommendation by U.S. Secretary of Defense Ash Carter; the strikes hit an ISIL tank and two vehicles that posed a threat to forces aligned with Libyan GNA (Government of National Accord). This was the third U.S. air strike against ISIL militants in Libya, but this time U.S. officials said it marked the start of a sustained air campaign rather than another isolated strike, U.S. airstrikes would continue to target ISIL in Sirte in order to enable the GNA to make a decisive, strategic advance. United States Africa Command (AFRICOM) oversaw the US effort, which was known as Operation Odyssey Lightning. AV-8B Harrier IIs assigned to the 22nd Marine Expeditionary Unit (22nd MEU) flying off conducted the airstrikes and uncrewed aircraft launched from undisclosed locations. Airstrikes continued, on 2 August, airstrikes hit a rocket launcher, an excavator and a pickup truck with a mounted recoilless rifle and on 3 August airstrikes struck a pickup truck with a mounted recoilless rifle; by 9 August the U.S. conducted 28 strikes against ISIL in Libya, with more than half of the strikes being conducted from uncrewed aircraft. By 16 August, U.S. airstrikes hit an ISIL vehicle and 4 militant positions in Sirte, bringing the number of U.S. airstrikes in Libya to 48. On 17 August, U.S. Africa Command officials announced on 16 August airstrikes on ISIL targets in Sirte struck 7 enemy fighting positions, 4 vehicle-borne bombs, 1 pickup truck with a mounted recoilless rifle, 12 enemy fighting positions and 1 command-and-control vehicle, bringing the total number of airstrikes in support of Operation Odyssey Lightning to 57. On 22 August, Stars and Stripes reported that U.S. Marine AH-1W SuperCobra helicopters participated in strikes against ISIL militants in Sirte on 20 and 21 August; a small detachment of U.S. special forces in Sirte provided most of the targeting information for the airstrikes which were then relayed to U.S. forces through Libyan government troops. On 31 August, Stars and Stripes reported that the U.S. military conducted 104 airstrikes against ISIL targets in Libya in August.
On 22 September, the pace of U.S. airstrikes against ISIL militants in Libya slowed in September as the number of insurgents holed up in a hard-to-target section of Sirte had shrunk, (the U.S. conducted 50 airstrikes against ISIL targets, compared with 108 in August) with about 200 militants remaining. On 28 September, Fox News reported that as of 26 September, U.S. Marine Corps Harrier jets and attack helicopters as well as drones conducted 175 airstrikes against ISIL in Libya, according to the U.S. military's Africa Command. According to a U.S. official the number of ISIL fighters in Sirte was estimated to be "under 100" and that "ISIS is only in three neighborhoods."
On 2 October, the U.S. conducted 20 airstrikes (bringing the total number of strikes to 201) in Libya: knocking out a command and control facility, nearly 70 ISIL fighting positions and several other sites in what was the heaviest day of bombing since the operation began, according to U.S. Africa Command data. The strikes were in support of an offensive by ground forces aligned with the internationally backed Libyan government. On 11 October, the U.S. conducted 51 airstrikes against ISIL targets in Libya, particularly in and around Sirte, between 7 and 10 October, marking it as some of the heaviest bombing since the start of the operation; bringing the total number of U.S. airstrikes in Libya to 261. On 17 October, Fox News reported that US airstrikes against ISIL in Libya doubled in less than a month (bringing the number of airstrikes up to 324). On 21 October 2016, deployed to the Mediterranean Sea as part of Operation Odyssey Lightning to replace the USS Wasp in its role against ISIL. San Antonio carried UH-1Y Hueys and AH-1W Cobras from the 22nd MEU's Aviation Combat Unit, VMM-264; Marine Harrier fighters were part of the operation aboard Wasp, however San Antonio did not host fighter jets.
On 4 November 2016, Fox News reported that the U.S. military ended its bombing campaign against ISIL in Sirte after three months of round-the-clock airstrikes the U.S. military conducted a total of 367 airstrikes since 1 August 2016. According to officials, no American airstrikes took place since 31 October; units taking part in the operation received orders on 1 November from AFRICOM to end offensive and collective self-defense airstrikes. A senior defense official said the U.S. military would "continue to provide military support to the GNA...ISIL-held territory in Sirte is down to a few hundred square meters. We'll continue to discuss with the GNA leadership what additional support they may need moving forward including air strikes."
Sirte was liberated by GNA forces in early December. On 20 December 2016, AFRICOM said that it carried out 495 airstrikes against militant vehicles and positions in the former ISIL stronghold of Sirte. Operation Odyssey Lightning concluded on 19 December, following an announcement from the Libyan government of the end of offensive military operations in Sirte.
On 18 January 2017, two United States Air Force B-2 bombers and one Reaper drone struck two ISIL camps south of Sirte, killing more than 80 ISIL militants. The two bombers launched from Whiteman Air Force Base in Missouri, flying round-trip for 34 hours to conduct the strikes. The B-2s dropped over 100 GPS-guided bombs on the two camps, after which a Reaper drone from Naval Air Station Sigonella in Sicily surveyed the area. One official called the airstrikes "a huge success," with more than 80 ISIL fighters killed, one counter-terrorism official told ABC News there were "zero survivors" at the camps. Many of the ISIL fighters in the camps had fled Sirte during the battle, according to another official; Pentagon press secretary Peter Cook said in a statement ISIL fighters had fled to the remote desert camps "in order to reorganize and they posed a security threat to Libya, the region, and U.S. national interests". The militants were carrying weapons, wearing tactical vests and standing in formation. The airstrikes were authorized by President Obama and were carried out in coordination with GNA; they were considered to be an extension of Operation Odyssey Lightning. US Defense Secretary Ash Carter said those targeted were "actively planning" attacks in Europe. NBC News later reported that the number of ISIL fighters killed was revised upward to 90; a U.S. defense official said that "This was the largest remaining ISIS presence in Libya," and that "They have been largely marginalised but I am hesitant to say they've been completely eliminated in Libya."
On 22 September 2017, the U.S. conducted six airstrikes with unmanned aircraft on an ISIL camp southeast of Sirte, killing 17 ISIL militants and destroying three vehicles. AFRICOM stated the strikes took place "In coordination with Libya's Government of National Accord and aligned forces" and that "The camp was used by ISIS to move fighters in and out of the country; stockpile weapons and equipment; and to plot and conduct attacks". The strikes marked the first time airstrikes had been carried out in the country under the Donald Trump administration.
Other actions The U.S. military has been closely monitoring ISIL movements in Libya, and small teams of U.S. military personnel has moved in and out of the country over a period of months. British, French, Italian and Jordanian special forces as well as the British Royal Air Force also have been in Libya helping with aerial surveillance, mapping and intelligence gathering in several cities, including Benghazi in the east and Zintan in the west, according to two Libyan military officials who were coordinating with them. British and American special forces have also been carrying out intelligence-gathering operations around Sirte.
Since the beginning of 2016, British Special forces have been escorting teams of MI6 agents to meet with Libyan officials and organise the supplying weapons and training to the Libyan army and to militias fighting against ISIL. On 27 February 2016, The Telegraph reported that British special forces had deployed alongside its U.S. counterparts in the city of Misrata to stop ISIL from advancing further, their main role being to give tactical training to local militias and to build an army to fight ISIL. In May 2016, it was reported that British special forces had engaged in frontline combat against ISIL in Libya; in particular they destroyed two ISIL suicide vehicles that were targeting Libyan fighters. On 12 May, at the Shaddadah Bridge, south of Misrata, the approach of a suicide vehicle sent Libyan forces fleeing in panic, British special forces intervened and destroyed the vehicle with a missile. An estimated dozen U.S. special forces operated out of a base near Misrata and were in action near Tripoli.