Here's another map that offers a lot of open area to run in, as well as enclosed structures if you feel like waiting someone out. Fringe takes place on a forgotten farm town out in rural Southern California, right near a massive space launch facility. That won't come into play, though, as you'll mostly deal with the local surroundings while watching for soldiers to come out of buildings, or going into them to hunt them down.
This is a fairly sized map from end to end, with a lot of routes to get from one to the other. The center, again, is a hot spot for those crossing between buildings or passing through the outside, so make sure to have snipers ready for them, or a couple of soldiers on the ground. It never hurts to hang around the south end either, as the three smaller structures down there make for ideal hiding spots, in case any enemies come running.