Alférez de Navío José María Sobral (April 14, 1880 – April 14, 1961) was an Argentine military scientist, Navy Sub-Lieutenant who rose to prominence by participating in the Swedish Antarctic Expedition (1901–1904) becoming the first Argentine overwinter in Antarctica.
 Later he pursued studies at Uppsala University becoming the first Argentine to obtain a geology degree.
 Sobral worked briefly as ambassador to Norway in 1930 before returning to Argentina to work at YPF.
The Navy of the Argentine Republic or Argentine Navy (Spanish: "Armada de la República Argentina" — ARA, also "Armada Argentina") is the navy of Argentina.
 It is one of the three branches of the Armed Forces of the Argentine Republic, together with the Army and the Air Force.
 Each ship of the Argentine Navy is designated with the prefix "ARA" before its name.
Sobral Peninsula ( ) is a high and mainly ice-covered peninsula projecting from Nordenskjöld Coast in northern Graham Land, Antarctica.
 The feature is 11 nautical miles (20 km) long and 5 nautical miles (9 km) wide and projects southward between Larsen Inlet to the east and Mundraga Bay to the west.
 The name was applied by United Kingdom Antarctic Place-Names Committee (UK-APC) (1963) and derives from Cape Sobral at the south end of this peninsula.
Mount Elliott ( ) is a conspicuous mountain, 1,265 m high, with a few small rock exposures and ice-free cliffs on the southeast side, standing 18 mi northwest of Cape Sobral and 8 mi northeast of Rice Bastion, on the Nordenskjöld Coast of Graham Land, Antarctica.
 The peak is surmounting Dinsmoor Glacier to the north, Mundraga Bay to the southeast, and Desudava Glacier to the southwest.
 It was charted in 1947 by the Falkland Islands Dependencies Survey (FIDS) and named for F. K. Elliott, the leader of the FIDS base at Hope Bay in 1947 and 1948.
Mundraga Bay (Bulgarian: "залив Мундрага" , ‘Zaliv Mundraga’ \'za-liv mun-'dra-ga\) is the 28.6 km wide bay indenting for 23 km Nordenskjöld Coast in Graham Land, Antarctica.
 It is entered east of Fothergill Point and west of Cape Sobral.
 Local coastline is modified as a result of the Larsen A Ice Shelf disintegration and the subsequent retreat of the inflowing Darvari Glacier, Boryana Glacier, Desudava Glacier, Dinsmoor Glacier, Bombardier Glacier and Edgeworth Glacier in the 1990s and the early 21st century.
Mount Lombard ( ) is the highest peak dominating the mountain mass whose southern extremity is Cape Sobral, Graham Land, Antarctica, and surmounting Mundraga Bay to the west.
 It was mapped from surveys by the Falkland Islands Dependencies Survey (1960–61), and was named by the UK Antarctic Place-Names Committee for American engineer Alvin O. Lombard of the Lombard Steam Log Hauler Company, Waterville, Maine, who designed some of the earliest successful over-snow tractors, the first application of knowledge of snow mechanics to trafficability, 1901–13.
Sobral – O Homem que Não Tinha Preço is a 2013 Brazilian documentary film directed by Paula Fiuza.
 The film is a biography of the jurist Sobral Pinto, who faced the dictatorship in Brazil and became one of the greatest defenders of human rights in the country's history.
Salvador Vilar Braamcamp Sobral (] , born 28 December 1989) is a Portuguese singer, who won the Eurovision Song Contest 2017 in Kiev, Ukraine for Portugal with the song "Amar pelos dois", written and composed by his sister Luísa Sobral.
 In doing so, he gave his country its first ever win in the contest since its debut in 1964 , ending the longest winless run by a country in Eurovision history (53 years).
 He and his entry hold the Eurovision record for the highest-scoring winner, having earned a total of 758 points under the current voting system, after winning both the jury vote and televote.
Cape Sobral ( ) is a high, mainly snow-covered elevation which surmounts the south end of Sobral Peninsula, and forming the east side of the entrance to Mundraga Bay on the east coast of Graham Land in Antarctica.
 Discovered by the Swedish Antarctic Expedition, 1901–04, under Nordenskjold, who named it for Lieutenant Jose M. Sobral of the Argentine Navy, asst. physicist and meteorologist with the expedition.
Larsen Inlet is an inlet, formerly ice-filled, 12 nmi long in a north–south direction and 7 nmi wide, between Cape Longing and Cape Sobral along the east coast of Graham Land, Antarctica.
 Carl Anton Larsen, a Norwegian whaling captain, reported a large bay in this area in 1893, and Larsen's name was suggested for the feature by Edwin Swift Balch in 1902.
 The inlet was re-identified and charted by the Falkland Islands Dependencies Survey in 1947.
 Mount Brading lies 4 nautical miles (7 km) east of the northeast corner of Larsen Inlet.

Question: What is the acronym of the country's navy that was responsible for discovering Cape Sobral?
Answer: ARA