In Chile, the Chilean military is regarded as one of the top militaries in the region; it is responsible for territorial defense and ensuring the country’s sovereignty; the military also assists with disaster and humanitarian relief and some internal security duties such as border security or maintaining public order if required; a key focus in recent years has been securing the border area with Bolivia and Peru; it trains regularly and participates in bilateral and multinational training exercises, as well as international peacekeeping operations 

the Chilean Army was founded in 1810, but traces its origins back to the Army of the Kingdom of Chile, which was established by the Spanish Crown in the early 1600s; the current Army has six divisions, an aviation brigade, and a special operations command; the divisions are comprised of a mix of armored, light infantry, mechanized infantry, motorized infantry, and mountain infantry brigades, regiments, and detachments; Chile's military aviation was inaugurated in 1913 with the creation of a military aviation school; the modern Air Force has about 200 fixed-wing aircraft and helicopters, including about 50 US-made fighters

the Navy traces its origins to 1817; it was first led by a British officer and its first ships were largely crewed by American, British, and Irish sailors; by the 1880s, the Chilean Navy was one of the most powerful in the Americas, and included the world’s first protected cruiser (a ship with an armored deck to protect vital machine spaces); today, its principle warships are eight frigates, four offshore patrol ships, a landing platform dock (LPD) amphibious assault ship, and four attack submarines; these are supported by a few missile attack craft and dozens of coastal patrol boats; the Navy also has marine amphibious infantry brigade and an aviation force with maritime patrol and anti-submarine warfare aircraft

Chile and Argentina have a joint peacekeeping force known as the Combined Southern Cross Peacekeeping Force (FPC), designed to be made available to the UN; the FPC is made up of two battalions, one from each country, a command and service company, an air component (a squadron of Argentine and Chilean helicopters), a naval component, and a combined logistics support unit (2023)