NAVPERS Report of Changes abbreviation

Hyperwar has been a tremendous help to me in my USN research over the past 15 years. Patrick Clancey was a mentor and friend in the early years.

Researching crewmembers who died in service aboard a USN Cruiser for upcoming publication. I ran across an abbreviation that has me stumped. Have been searching the Internet for days and can find no explanation.

Sailor appears on the ship's Report of Changes (NAVPERS 605b), 1 July 1945, with rate of CGMA (Chief Gunner's Mate Acting) and the following information is shown:
Change of Status: JJ
Description of Change: NTSCH Seattle WN [Naval Training School, Seattle, Washington]
Date of Occurrences: 6/14
Service Number: xxx-xx-xx

My question is about the Change of Status. What does "JJ" mean??
Any information or even a wild guess would be very much appreciated. I am dedicated to remembering those Lost At Sea in WWII.

 

I have not, but will do this. Thank you so much for the response!