Here is an interesting wiki page:
https://de.wikipedia.org/wiki/Argentinisch-Deutsche_Militärkooperation
Translated with www.DeepL.com/Translator :
Training of Argentine officers in Germany
Conversely, between 1902 and the outbreak of World War I - military attachés, army doctors and young cadets included - 196 officers came to Germany. They were detached to various German regiments and units, including the Prussian War Academy, the Military Academy, shooting ranges and maneuvers. A high proportion of the officers sent to Germany (59 of the 196) later rose to general rank.Two became chiefs of staff, one, José Félix Uriburu, Argentine president.
Arms deliveries from France and the German Reich
Brazil, Peru and Uruguay had French military missions and bought their weapons in France.
Argentina, Chile and Ecuador had arms supply contracts with German arms manufacturers until 1928 and recruited military advisers in Berlin. Argentina bought from 1864 to 1913:
125,000 rifles and carbines model 1889, 236,000 model 1891 and 157,000 model 1909 at Mauser
1,433 cannons at Krupp
to them ammunition, explosives, detonators, shells, propellants, bayonets, binoculars, etc.
Argentina increased its arms purchases when the Beagle Canal and the Beagle conflict began soon after the border treaty of 1881 with Chile was signed. In the 1890s, the armament of the Argentine army was purchased almost exclusively from German manufacturers.