The Pentagon identifies the Marine who was reported missing at sea off the Southern California coast as Lance Cpl. Armando Ortiz Canseco, 21, of Minnesota. The Marine is declared deceased after being reported missing from the amphibious transport dock ship USS Anchorage on Thursday. Following the report, the U.S. military launches an extensive search and rescue operation. The Hill reports that the disappearance prompted the search after Ortiz Canseco was last known aboard the USS Anchorage. Military Times similarly states that he disappears from the ship on Thursday and that a search and rescue effort follows. Both outlets report that Ortiz Canseco is declared dead on Saturday. Details beyond his identity, including the circumstances of his disappearance and the results of the search, are not described in the provided accounts.