William,
I read your book with interest as my father Clyde S. Sayce served with CASU 11 on Guadalcanal. Of note is I believe I've identified his image in the photo in the pic of the Radio Gang. He distinctly recalled the trip over and back on the troop ship.
He said "on the most beautiful evening as we steamed across the Pacific to calm seas and the setting sun, we were all (as many as could get up there) on the foredeck to escape the heat below, a man was playing a harmonica and he pause and take requests, a voice would ring out "do you know this song?" The harmonica player would respond no, but hum a few bars' and there'd be this humming and the harmonica player would say "oh I know that", and start playing again.
Of course Dad was a radioman, and trained in radar theory and tech. His route to CASU 11 was through College Station Texas where a 100 men? where sent through a year's long course on radio and radar theory-Technology by Sperry Rand. Then they joined CASU 11 in California, San Diego I believe.
Jim