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Armed forces

The president holds the title of commander-in-chief of the Argentine Armed Forces, as part of a legal framework that imposes a strict separation between national defense and internal security systems: The National Defense System, an exclusive responsibility of the federal government, coordinated by the Ministry of Defense, and comprising the Army, the Navy and the Air Force. Ruled and monitored by Congress through the Houses' Defense Committees, it is organized on the essential principle of legitimate self-defense: the repelling of any external military aggression in order to guarantee freedom of the people, national sovereignty, and territorial integrity. Its secondary missions include committing to multinational operations within the framework of the United Nations, participating in internal support missions, assisting friendly countries, and establishing a sub-regional defense system.

Military service is voluntary, with enlistment age between 18 and 24 years old and no conscription. Argentina's defense has historically been one of the best equipped in the region, even managing its own weapon research facilities, shipyards, ordnance, tank and plane factories. However, real military expenditures declined steadily after the defeat in the Falklands/Malvinas War and the defense budget in 2011 was only about 0.74% of GDP, a historical minimum, below the Latin American average. Within the defence budget itself, funding for training and even basic maintenance has been significantly cut, a factor contributing to the accidental loss of the Argentine submarine San Juan in 2017. The result has been a steady erosion of Argentine military capabilities, with some arguing that Argentina had, by the end of the 2010s, ceased to be a capable military power.

The Interior Security System is jointly administered by the federal and subscribing provincial governments. At the federal level it is coordinated by the Interior, Security and Justice ministries, and monitored by Congress. It is enforced by the Federal Police; the Prefecture, which fulfills coast guard duties; the Gendarmerie, which serves border guard tasks; and the Airport Security Police. At the provincial level it is coordinated by the respective internal security ministries and enforced by local police agencies.

Argentina was the only South American country to send warships and cargo planes in 1991 to the Gulf War under UN mandate and has remained involved in peacekeeping efforts in multiple locations such as UNPROFOR in Croatia / Bosnia, Gulf of Fonseca, UNFICYP in Cyprus (where among Army and Marines troops the Air Force provided the UN Air contingent since 1994) and MINUSTAH in Haiti. Argentina is the only Latin American country to maintain troops in Kosovo during SFOR (and later EUFOR) operations where combat engineers of the Argentine Armed Forces are embedded in an Italian brigade.

In 2007, an Argentine contingent including helicopters, boats and water purification plants was sent to help Bolivia against their worst floods in decades. In 2010 the Armed Forces were also involved in Haiti and Chile humanitarian responses after their respective earthquakes.