The first one is very offensive and disrespectful to our country. Get rid of it entirely.
The rest, well looks to me like you just used stock text, and other photos with a few over flashy effects.
The second image shows great promise, however, it seems a little hard to tell what it says, as you are trying to be too flashy. Remember, with logos, simplistic>stylistic>flashy. Just get to the point in your logo, maybe add a few effects, but don't go overboard, if it's too flashy, then only half your audience will enjoy it, and the other half will hate it or not even understand it.
3rd image is a good example of simple and to the point and easy to understand. Make more like that one, and you are on the way to good logos. A few of the later ones are also not as bad as the earlier ones, but they aren't as good as the 3rd. Also remember that your text does not have to be centered and in fact, it's often good not to center it, as it allows the eye to travel across the image, yet still understand the concept. If it's centered, then the eye is dragged right to it, thus not exploring the rest of the image. This isn't always true, but it's rare when the text being centered is a good thing. If you don't believe me, go look at a few professional sites you know of, and tell me where that text is half the time on logos. Notice how its usually to the left or to the right. Its usually only in the center when the entire image is a design of its own, also symmetrical, thus requiring the text to also be centered. It's really hard to explain, but use your better judgment on this and it will become simple.
The last picture is just too random, and I don't even know what to say. It has way too much going on, and it's not very appealing.
Your work is pretty good, but lacks discipline. Don't go overboard, and be sure your work gets to the point.
Edit: the space planet one I just now noticed. It looks pretty good. It's simple, and gets to the point. Maybe just tone down that lens flare and its a winner for sure. Maybe also move the planet to the right so the eye explores the image more.
