This subreddit describes itself as being 'a place for men who love hot men in uniform'. It goes on to explain that you'll see soldiers, police officers, office workers and a whole bunch of other types of uniform-themed pleasures. Note that while the name of the subreddit isn't exactly suggestive, I can confirm that the material here is all gay-focused (or at the very least, 90% of it is).
There are just over 3,500 subscribers to the subreddit, which make it a little small when compared to a lot of other gay-themed subreddits. Because of this, the flow of material is very, very slow. I mean, the homepage has content that was uploaded over a month ago, which basically means that no one bothers to submit and waits for others to do so.
I suggest you head on over to /r/MenInUniform to get this place kickstarted. I'll start posting in a few days and if we both work on it, this place will hopefully be as good as I think it can be!