I don't think a public announcement would really server your purpose well, but making an effort starting a word of mouth campaign could pay off. If you have facilities to host meetings, show and tell (and age verification on the spot), you could probably get a good number of interesting players.
Advertising publically is more likely to net you CS style players, although at least at a college you're dealing with an older group. I still voted yes, because realistically players who cheat and don't get along with the community, usually find themselves on the outside looking in, but it can still be a real headache.
If you focus on the milsim, tactical, and competition aspects, rather than just that guns look cool, you'll also get different types of players...