The USS YF-415 was a fleet tugboat that served in the United States Navy. During its final mission, the commander was Lieutenant Commander John W. McLain. The vessel was involved in a significant operation in 1985, but specific details about the mission and its context may vary.

For more detailed information, you might want to check naval histories or archives that cover the operations of the USS YF-415 specifically. If you need more specific details or context about that mission or its commander, please let me know!