In Lebanon, the LAF’s primary responsibilities are defense against external attack, border security, protecting the country’s territorial waters, and assisting with internal security and development projects; on Lebanon’s eastern and northern borders with Syria, the LAF has conducted operations to prevent or eliminate infiltrations of militants linked to the Islamic State of Iraq and ash-Sham (ISIS) and al-Qa’ida terrorist groups since the start of the Syrian civil war in 2011; in the south, its focus is on maintaining stability along its volatile border with Israel where the LAF and the Israel Defense Forces (IDF) are separated by the "Blue Line," a demarcation line established by the UN in 2000 following the withdrawal of the IDF, which had occupied southern Lebanon since invading in 1982; since the line’s establishment, the LAF and IDF have had periodic clashes, and IDF aircraft have routinely entered Lebanese air space; the Iranian-backed terrorist group Hizballah is based in south Lebanon and acts as a militia alongside the LAF; it has launched periodic cross-border attacks on Israel and threatened additional attacks, while the IDF has conducted air strikes on Hizballah positions and in 2006 launched a ground invasion into southern Lebanon to suppress the group; in 2022, Israeli and Lebanese officials agreed on a common demarcation of their maritime border after US mediation

the LAF’s domestic security responsibilities include countering narcotics trafficking and smuggling, managing protests, conducting search and rescue, and intervening to prevent violence between rival political factions; in recent years, the military has faced a financial crisis as government debt and national economic difficulties have undercut its ability to train and fully pay and supply personnel, which has sparked domestic and international fears that the armed forces may disintegrate; the UN, as well as countries such as France and the US have provided financial assistance 

the Army has about 12 infantry brigades (including a presidential guard brigade) that are supplemented by independent armored, artillery, border security, and “intervention” infantry regiments, as well as a special operations force comprised of airborne, marine commando, and ranger regiments that are regarded as the LAF’s elite units; the Air Force has a small inventory of aging combat aircraft and helicopters, while the Navy operates a mix of patrol craft and patrol boats

the UN Interim Force In Lebanon (UNIFIL) has operated in the country since 1978, originally under UNSCRs 425 and 426 to confirm Israeli withdrawal from Lebanon, restore international peace and security, and assist the Lebanese Government in restoring its effective authority in the area; following the July-August 2006 war, the UN Security Council adopted resolution 1701 enhancing UNIFIL and deciding that in addition to the original mandate, it would, among other things, monitor the cessation of hostilities, support the LAF as they deployed throughout the south of Lebanon, and provide assistance for humanitarian access for civilians and the return of displaced persons; UNIFIL has approximately 9,500 military personnel deployed in the country and includes a maritime task force (2023)