02-23-2018, 11:51 PM
I think the numbers after job titles are the MOS (military occupation specialty) numbers. Honestly, each individual was reduced to his MOS and was assigned just like parts in a supply chain.
Not sure about the self-propelled 90mm; Try googling it...or try the Fort Sill web site and history. Sill was a major AAA training camp during the war. My Father did basic there before being shipped to an CA battery overlooking Seattle.
theron