Post
Region: Novus Lucidum
Slightly better soldiers?
There are not really much you get directly for defense forces the same way you get for things like Arms manufacturing or IT. It isn't a production stat.
That said, having high defense forces score will make your soldiers better and will affect the number of troops you can field. You have increased the soldiers you can field a lot already since you created your nation, doubling your Navy and tripling the number of infantry corps.