The ARA Suboficial Castillo (A-6) is an Abnaki class tug patrol boat of the Argentine Navy. She previously served in the US Navy as USS Takelma (ATF-113) from 1944 to 1976. Suboficial Castillo is used as support ship for both the Argentine Submarine Force and during the summer campaigns in Antarctica in the Patrulla Antártica Naval Combinada (English: Joint Antarctic Naval Patrol) with the Chilean Navy to guarantee safety to all touristic and scientific ships that are in transit within the Antarctic Peninsula.