After minor repairs, Almirante Domecq Garcia (D-23) left California in October 1971, reaching El Callao, Argentina, in November. She arrived at the Naval Base of Puerto Belgrano and joined the fleet on 21 November 1971.
In 1975, Almirante Domecq Garcia observed the British Royal Research ShipRRS Shackleton conducting oceanographic investigations in waters claimed by Argentina. In 1976, Almirante Domecq Garcia operated in joint exercises with the Brazilian ships Pernambuco and Maranhao. She participated in the international exercise UNITAS XVII in 1976, with the Uruguayan Navy in the exercises CORMORAN IV and VI in 1977 and 1978 respectively, and in the international exercise UNITAS XXI in 1980. During the Falklands War in 1982, she operated near Bahia Blanca as a radar picket ship to provide early warning of British air attacks. She also fulfilled functions related to the control of Argentine waters, looking for fishing ships operating illegally in waters claimed by Argentina.
The logbook of the Argentine Navy patrol vesselARA Francisco de Gurruchaga offers a different account of the fate of Almirante Domecq Garcia. It states that on 16 November 1986 Francisco de GurruchagatowedAlmirante Domerq Garcia to the position 39°57′S057°56′W / 39.950°S 57.933°W / -39.950; -57.933 and stopped her engines at 17:30 with Francisco de Gurruchaga 1 nautical mile (1.9 km; 1.2 mi) from Almirante Domerq Garcia. At 19:04, Francisco de Gurruchaga lost contact with Almirante Domerq Garcia, indicating Almirante Domerq Garcia had sunk.