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.

https://www.militarytimes.com/off-duty/military-culture/2022/10/12/that-one-time-…
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https://www.reddit.com/r/todayilearned/comments/1gcsbrd/til_while_traveling_to_the_tehran_conference_in/