The AP style guide suggests that things like "Farmers Markets" or "Veterans Cemeteries" cannot "belong" to the members of the groups for which they were set up.
I would posit that a thing for the use of a group (e.g., farmers or veterans), has an implied ownership...more collectively, but I feel it's ownership nonetheless, and would write farmers' market and veterans' cemetery.
Anyone have any experience with this, and can anyone explain the subtleties of ownership vs non-ownership in these cases? I'm trying to wrap my head around why AP chose the guideline they did.