Military? That sounds interesting!
Do you mean something like an Officer's or Enlisted Men's club?
Really, a military barroom is pretty much like any other...there's a drinks bar, some stools, some bottles in cases on the walls, maybe a pool table or some darts, possibly some steaks and a couple of small dining tables...that sort of stuff. The only thing different from a civilian bar would be the types of pictures on the walls, and possibly the type of music playing (the military one would be louder, more than likely
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Since we have no military deco at all, well...wow!
Now as for military clothing...
https://www.google.com/search?q=sims+4+ ... KZQo&tbo=uHere's a speed build for a military base.
https://www.youtube.com/watch?v=jDsSOM1Glu0Bunker.
https://www.youtube.com/watch?v=JOARSJ8KbfMYou could probably use some of the ideas in those two builds.