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I don't know if it's correct to say the last strike was "unplanned night ops". Spruance knew the distances involved and that the aircraft would be coming back after sunset.Quite a famous incident involving unplanned night ops during the Battle of the Philippine Sea (second to last paragraph).
http://militaryhistory.about.com/od/worldwari1/p/philippinesea.htm
Anyone who volunteered for night carrier ops was by definition certifiably weird'.