Welcome, and thanks for your service. You'll make a lot of friends here.
I use a Testors Aztek double action and compressor. The whole setup cost me around $ 350. I also have a fume booth, which is a pretty useful thing, but not absolutely essential.
I like the Aztek more than some others I've owned, like the Paasche, because it's modular- you just unscrew the tip and drop it in thinner to clean it, and it's easy to switch tips. The other ones you need to field strip, reassemble and set the adjustments up again.
You also can do a lot with spray cans. If you don't feel like dropping $$$ on something you are not sure you are going to like long term, and depending on your subjects, thats the way to go. I painted my armor models for years with rattlers, and things like airliners, olive drab over gray airplanes, cars etc. will please you just fine.
Some of us older guys can't read fancy type so well, so sign be up for the easy-read fonts in your next post.
Bill