The Argentine Submarine Force Command (Spanish: Comando de la Fuerza de Submarinos, COFS) is the submarine service branch of the Argentine Navy. Argentine submarines have traditionally been named after the provinces of the Republic whose name begins with the letter 'S'; they are home based at Mar del Plata Naval Base. COFS members have the same rank insignia and titles as the rest of the Navy. As of 2010, the elite group Agrupación de Buzos Tácticos is under the direct command of the submarine force. After the disappearance of ARA San Juan in November 2017, one TR-1700 (ARA Santa Cruz (S-41)) and one Type 209 (ARA Salta (S-31)) submarines remain on the naval list, though neither is operational. Two small surface vessels, ARA Punta Mogotes (P-65) and ARA Luisito (Q-51), are also part of the