Alright, I'll bite. Assuming that the clock is rolled back 60 or so years and that otherwise I am still the same person career and experiance-wise I would have certainly immediately been promoted to Lieutenant in the US Navy (as were many career Chief Petty Officers both active and reserve (me) on the outbreak of WW II in the US)and assigned as a division officer aboard a larger unit (most likely a cruiser) for 4 - 6 months and then promoted to Lieutenant Commander and Department Head in Engineering (my background).
If my ship wasn't sunk by the end of 1942 I would even survive the war. I would have ended the war promoted to Commander. After the war (as I would have started out with 24 years of experiance)I would have retired and resumed my civilian career.
Not glamorous but it's what I do well.