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The original was posted on /r/todayilearned by /u/UndyingCorn on 2024-10-26 19:03:41+00:00.

Original Title: TIL While traveling to the Tehran Conference in 1943 on the USS Iowa, FDR’s ship was almost torpedoed by the escorting destroyer USS William D Porter. The incident was caused when one of the destroyer’s crew members failed to remove the primer of the torpedo while doing a training exercise.