It is spring 1944, I am in command of USS Balao. My mission is to insert a spy on the Japanese Home Islands (forget the city). I make the drop without being detected and scoot back to Midway to re-fuel before deciding what to do next. (I was given no additional goal after completing the spy drop). It was late for me when I got to Midway, so I re supplied, saved the game and shut down and went to bed.
The next evening I loaded the save and much to my suprise I found that the 5"/20 bow mounted deck gun that I left Pearl with was now a 4"/50.
Honestly, issues with game saves are becoming a show stopper for me.