In El Salvador, the Armed Force of El Salvador (FAES) is responsible for defending national sovereignty and ensuring territorial integrity but also has considerable domestic security responsibilities; while the National Civil Police (PNC) is responsible for maintaining public security, the country’s constitution allows the president to use the FAES “in exceptional circumstances” to maintain internal peace and public security; in 2016, the government created a special 1,000-strong joint unit of Army commandos and police to fight criminal gangs; more military personnel were devoted to internal security beginning in 2019 when President BUKELE signed a decree authorizing military involvement in police duties to combat rising gang violence, organized crime, and narcotics trafficking, as well as assisting with border security; since the decree, a considerable portion of the Army has been deployed in support of the PNC; in multiple cases since 2022, for example, as many as 8,000 troops have been deployed alongside thousands of police on single operations against criminal gang members 

the FAES exercises with regional partners and the US, in such areas as internal security and disaster relief operations; it has deployed small numbers of personnel on UN peacekeeping missions and in support of military operations in Iraq (2003-2009) 

the military led the country for much of the 20th century; from 1980 to 1992, it fought a bloody civil war against guerrillas from the Farabundo Martí National Liberation Front or FMLN, the paramilitary arm of the Democratic Revolutionary Front (Frente Democrático Revolucionario), a coalition of left-wing dissident political groups backed by Cuba and the Soviet Union; the FAES received considerable US support during the conflict; significant human rights violations occurred during the war and approximately 75,000 Salvadorans, mostly civilians, were killed (2025)