I was primarily wondering what happened between the completion of the AG course in Aug. 43 and being transferred in July 45. There's no apparent gap in the typing, just nothing reported for those two years.
However, since I posted earlier today, I decided to look into the trial membership at ancestry.com and I found two ship manifests from that gap time -- the Mumford Pearson in 44 and the Nicollet in 45. Both show Dad as a S1/c. I think he'll be excited to see these!