Great question. I was thinking of the same deduction as what you did.
I would suggest that you ask this question within the following History Hub forum (free registration of course).
I've asked a few questions within a few different topics and someone was always provided something helpful there regarding the older Government/Military Forms (with links and such).
Though I'm not referring to anyone here that may know the answer as well.
I wish you the best of luck! :-))
-- ~Brian D. Kerr, Esq | SSG, U.S. Army (Retired) | SSA, Brigade G1, U.S. Army (Retired) |>>Known Family Surnames (Researching): Dessler, Walk(Valk), Mahler (Maler), Paradisgarten (Paradisegarten), Tomasy (Thomashy), Gluck, Preisz (Priess), Steinhardt (Steinhart), Grossman (Grosman), Sholtz (Shultz), Kaplan, Bloom, Fischer (Fisher), Levy, Baum, Duwidewic, Meisal (Maisel)<<|>>Known Family Locations/Regions (of Surnames): Poland, Ukraine, Russia, Hungary, Lithuania<<|