Thank you guys!
So, I'll continue this way
Only correction needed, "Loader", not "Cannoneer"
In the 7 TO&E from 15/09/1943 to 21/06/1945, the US Army called it "Cannoneer (Specification S/N 2736)" so I'm feeling confident about that.
Odd, I've always heard them referenced as loaders, even by veterans. But if the TO&E of the US Army of the era called them "Cannoneers" then I submit to the correct term.