I think you’re talking about Lt. John “Captain Crunch” Sydney (referred to as “Captain” when in command of his tugboat) who earned the nickname when he rather i

I think you’re talking about Lt. John “Captain Crunch” Sydney (referred to as “Captain” when in command of his tugboat) who earned the nickname when he rather infamously pushed a cargo barge full of grain into a dairy transport causing both ships significant hull damage and making a rather soggy mess.