I think that I am not a good example of how Military Service is recorded. Gramps does not support that data very well yet.
(Before any decided that its deficiency is a reason to bring up main-subevents again, that is a discussion for another time. It would require a major redesign affecting a broad swatch of Gramps. And this should remain a discussion about patching a single import functionality.)
I know that somewhere down the I will have to figure out a way to have the Description data sortable, filterable but remain highly visible. So I’m trying to make the descriptions somewhat structured but still readable. Having done entries over a decade, it hasn’t been as consistent as I’d like.
I used a workaround in bulk imports for military that I’ve done. I imported roll call in a County History book for a local Civil War regiment : the companies A-F of the 100th Regiment (nicknamed the “Roundheads”) of the Pennsylvania Volunteer Infantry. And all the servicemen (and spouses) in a particular section’s row of gravestones of a US National Cemetery. (Neighbors in my parent’s row.) For both of these, I was able to use the Occupation Event because it had the necessary “Description”. Then coverted the type from “Occupation” to “Military Service” or “Burial”
Here’s a posting from another user wanting to do Military Service spreadsheet import: