we have records of every exam taken but for a time people were able to switch primarys with just a request so there should be some record of changes in the senior officer meeting archive but i have a feeling some might have slipped through un registerd,
what you have said has got me thinking, since we can change is there any point doing a specialism with the ensign exam? would it be beter to have a test on very basic use of each station and fleet protocal etc then do exam later on to qualify as a specialist on a perticular station ?