The Grupo 8 Mirages if my memory still serves me were based at Trelew in Northern Argentina they were subsequently moved to Rio Gallegos. The main problem was their Matra 530 missile which was not effective against small fast moving targets (think Phoenix) the other problem was that they had a very simple monopulse radar which when overland in a look down position could deliver nothing. Once they came down to play they were toast to the AIM-9L.